Jefferson County | |
---|---|
Motto: Gateway to the Rocky Mountains | |
Coordinates: 39°35′N105°15′W / 39.59°N 105.25°W | |
Country | United States |
State | Colorado |
Founded | November 1, 1861 |
Named for | Jefferson Territory |
Seat | Golden |
Largest city | Lakewood |
Area | |
• Total | 774 sq mi (2,000 km2) |
• Land | 764 sq mi (1,980 km2) |
• Water | 9.8 sq mi (25 km2) 1.3% |
Population (2020) | |
• Total | 582,910 |
• Estimate (2023) | 576,366 |
• Density | 750/sq mi (290/km2) |
Time zone | UTC−7 (Mountain) |
• Summer (DST) | UTC−6 (MDT) |
Congressional districts | 1st, 2nd, 6th, 7th |
Website | www |
Jefferson County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 582,910, [1] making it the fourth-most populous county in Colorado. The county seat is Golden, [2] and the most populous city is Lakewood.
Jefferson County is included in the Denver-Aurora-Lakewood, CO Metropolitan Statistical Area. Located along the Front Range of the Rocky Mountains, Jefferson County is adjacent to the state capital of Denver.
In 2010, the center of population of Colorado was located in Jefferson County. [3]
The county's slogan is the "Gateway to the Rocky Mountains", and it is commonly nicknamed Jeffco. The name Jeffco is incorporated in the name of the Jeffco School District, the Jeffco Business Center Metropolitan District No. 1, and several businesses located in Jefferson County. Jeffco is also incorporated in the unofficial monikers of many Jefferson County agencies. The Rocky Mountain Metropolitan Airport operated by Jefferson County was previously known as the Jeffco Airport.
A major employer in Jefferson County is the large Coors Brewing Company in Golden. Also, the state-supported Colorado School of Mines, a university specializing in mining, geology, chemistry, and engineering is located in Jefferson County.
On August 25, 1855, the Kansas Territorial Legislature created Arapahoe County to govern the entire western portion of the territory. The county was named for the Arapaho Nation of Native Americans who lived in the region.
In June 1858, gold was discovered along the South Platte River in Arapahoe County (in present-day Englewood) by William Greeneberry Russell and Sam Bates who had been following up the June 22, 1850, discovery of gold on Ralston Creek in today's Jefferson County by Lewis Ralston, for whom the creek was named. This discovery precipitated the Pike's Peak Gold Rush. The Doniphan Party upon arriving upon Clear Creek discovered markers left over from earlier mining in 1834 by the Estes Party, placed their own alongside and on November 29, 1858, founded the future county's first town of Arapahoe City upon the land southeast of today's West 44th Avenue and McIntyre Street (with West 44th running through the town). [4] On June 16, 1859, its second town, Golden, Colorado, was founded in the valley to the west. Many residents of the mining region felt disconnected from the remote territorial governments of Kansas and Nebraska, so they voted to form their own Territory of Jefferson on October 24, 1859. The following month on November 28, 1859, the Jefferson Territorial Legislature organized 12 counties for the new territory, including Jefferson County. Jefferson County was named for the namesake of the Jefferson Territory, Thomas Jefferson, the principal author of the Declaration of Independence and the nation's third president. [5] Golden City was elected on January 2, 1860, as the county seat of Jefferson County. Robert Williamson Steele, Governor of the Provisional Government of the Territory of Jefferson from 1859 to 1861, built his home in the county at Mount Vernon and later at Apex. Originally Jefferson County's borders extended to the 40th parallel north, the South Platte River (excluding the town of Highland) to the east, and to Bear Creek to the south.
The Jefferson Territory never received federal sanction, but during his last week in office, President James Buchanan signed an act which organized the Territory of Colorado on February 28, 1861. [6] That November 1, the new Colorado General Assembly organized the 17 original counties of Colorado, including Jefferson County. The reorganized Jefferson County extended to most of its current borders and Golden continued as county seat. In 1908, the southern tip of Jefferson County was transferred to Park County, reducing Jefferson County to its present length of 54 miles (87 km). Several annexations by the City & County of Denver and the 2001 consolidation of the City & County of Broomfield removed the east and extreme northeastern corner of the county, respectively.
According to the U.S. Census Bureau, the county has a total area of 774 square miles (2,000 km2), of which 764 square miles (1,980 km2) is land and 9.8 square miles (25 km2) (1.3%) is water. [7]
Jefferson County is one of the few counties in the United States to border as many as ten counties.
Census | Pop. | Note | %± |
---|---|---|---|
1870 | 2,390 | — | |
1880 | 6,804 | 184.7% | |
1890 | 8,450 | 24.2% | |
1900 | 9,306 | 10.1% | |
1910 | 14,231 | 52.9% | |
1920 | 14,400 | 1.2% | |
1930 | 21,810 | 51.5% | |
1940 | 30,725 | 40.9% | |
1950 | 55,687 | 81.2% | |
1960 | 127,520 | 129.0% | |
1970 | 233,031 | 82.7% | |
1980 | 371,753 | 59.5% | |
1990 | 438,430 | 17.9% | |
2000 | 527,056 | 20.2% | |
2010 | 534,543 | 1.4% | |
2020 | 582,910 | 9.0% | |
2023 (est.) | 576,366 | [8] | −1.1% |
U.S. Decennial Census [9] 1990-2000 [12] 2010-2020 [1] |
As of the census [13] of 2000, there were 527,056 people, 206,067 households, and 140,537 families residing in the county. The population density was 683 people per square mile (264 people/km2). There were 212,488 housing units at an average density of 275 people per square mile (106 people/km2). The racial makeup of the county was
90.59% | White | |
0.89% | Black or African American | |
0.75% | Native American | |
2.28% | Asian | |
0.08% | Pacific Islander | |
3.23% | from other races | |
2.18% in two or more races |
There were 206,067 households, out of which 33.40% had children under age 18 living with them, 55.10% were married couples living together, 9.10% had a female householder with no husband present, and 31.80% were non-families. 24.50% of all households were made up of individuals, of those 6.30% were someone living alone who was 65 years of age or older. The average household size was 2.52, and the average family size was 3.03 persons.
In the county, the population ages were spread out:
25.30% | under age 18 | |
8.10% | aged 18–24 | |
32.10% | aged 25–44 | |
24.90% | aged 45–64 | |
9.60% | 65 years of age or older | |
The median age was 37 years. |
For every 100 females there were 99.00 males. For every 100 females age 18 and over, there were 96.80 males.
The median income for a household in the county was $57,339, and the median income for a family was $67,310. Males had a median income of $45,306 versus $32,372 for females. The per capita income for the county was $28,066. About 3.40% of families and 5.20% of the population were below the poverty line, including 5.80% of those under age 18, and 5.10% of those age 65 or over.
According to a report in the JAMA, residents of Jefferson County had a 2014 life expectancy of 80.02 years. [14]
The sole school district serving the county is Jefferson County School District R-1. [15]
Jefferson County Public Library is the county library system.
The Board of County Commissioners operates as the governing body of the county. Established in 1861, the board consists of three commissioners who are elected at-large to four-year terms. The board sets policies that guide county programs and operations which serves residents and businesses. There are several elected officials that oversee a department or aspect of county operations. [17]
District | Commissioner | Party |
---|---|---|
District 1 | Tracy Kraft-Tharp | Democratic |
District 2 | Andy Kerr | Democratic |
District 3 | Lesley Dahlkemper | Democratic |
Title | Official | Party |
---|---|---|
Assessor | Scot Kersgaard | Democratic |
Clerk and Recorder | Amanda Gonzalez | Democratic |
Coroner | Dr. Annette Cannon | Democratic |
Sheriff | Regina "Reggie" Marinelli | Democratic |
Surveyor | Robert Hennessy | Republican [19] |
Treasurer | Gerald "Jerry" DiTullio | Democratic |
Jefferson County lies within the 1st Judicial District which is represented by District Attorney Alexis King. [20]
The Jefferson County Sheriff is an oldest elective office in Jefferson County (along with Clerk and Recorder, Assessor and Treasurer) and among the first popularly elected offices in Colorado, established in 1859 with the first Sheriff, Walter Pollard, elected on January 2, 1860. [21] Its office holders over the course of over 150 years have included some of the most noted law enforcement officers in Colorado history.
The Jefferson County Sheriff's Office responded to the 1999 Columbine High School massacre, and investigated it together with the F.B.I. The Sheriff's Office received backlash after it was revealed the agency had the perpetrators Eric Harris and Dylan Klebold in and out of custody prior to the shooting. After the shooting Sue Klebold sued the Sheriff's office for failing to prevent their son from carrying out the Columbine High shootings. According to a "notice of intent to sue" filed by Susan and Thomas Klebold, county officials were "reckless, willful and wanton" in the way they handled a 1998 police report about Eric Harris' Internet ravings. [22] [23] [24] This lawsuit was dismissed along with several others pertaining to the shooting. [25]
The current county sheriff is Regina "Reggie" Marinelli. [26] She was in elected 2022 and became the first woman to do so in county history and became the first Democrat to hold the office in nearly a century. She previously worked in the county Sheriff's Office for over 30 years. [27]
Jefferson County was a Republican stronghold for most of the 20th century. However, it has voted Democratic in every presidential election since 2008, consistent with the general trend in the Denver metropolitan area. In 2020, Joe Biden won the largest percentage for a Democratic presidential candidate since 1916.
Year | Republican | Democratic | Third party(ies) | |||
---|---|---|---|---|---|---|
No. | % | No. | % | No. | % | |
2020 | 148,417 | 39.33% | 218,396 | 57.88% | 10,545 | 2.79% |
2016 | 138,177 | 42.01% | 160,776 | 48.89% | 29,930 | 9.10% |
2012 | 144,197 | 46.36% | 159,296 | 51.21% | 7,559 | 2.43% |
2008 | 131,628 | 44.61% | 158,158 | 53.60% | 5,282 | 1.79% |
2004 | 140,644 | 51.79% | 126,558 | 46.60% | 4,366 | 1.61% |
2000 | 120,138 | 51.02% | 100,970 | 42.88% | 14,383 | 6.11% |
1996 | 101,517 | 48.41% | 89,494 | 42.67% | 18,712 | 8.92% |
1992 | 82,705 | 37.05% | 80,834 | 36.22% | 59,664 | 26.73% |
1988 | 110,820 | 56.39% | 81,824 | 41.64% | 3,867 | 1.97% |
1984 | 124,496 | 68.92% | 53,700 | 29.73% | 2,432 | 1.35% |
1980 | 97,008 | 59.66% | 41,525 | 25.54% | 24,078 | 14.81% |
1976 | 87,080 | 60.44% | 52,782 | 36.64% | 4,211 | 2.92% |
1972 | 80,082 | 69.88% | 31,555 | 27.54% | 2,960 | 2.58% |
1968 | 50,847 | 56.90% | 31,392 | 35.13% | 7,118 | 7.97% |
1964 | 33,398 | 43.48% | 43,162 | 56.19% | 252 | 0.33% |
1960 | 34,105 | 59.62% | 22,962 | 40.14% | 137 | 0.24% |
1956 | 25,398 | 63.71% | 14,270 | 35.80% | 197 | 0.49% |
1952 | 19,971 | 63.05% | 11,509 | 36.34% | 194 | 0.61% |
1948 | 9,903 | 51.29% | 9,145 | 47.36% | 260 | 1.35% |
1944 | 9,815 | 57.20% | 7,277 | 42.41% | 68 | 0.40% |
1940 | 8,780 | 52.81% | 7,745 | 46.59% | 100 | 0.60% |
1936 | 5,271 | 41.10% | 7,283 | 56.79% | 271 | 2.11% |
1932 | 5,522 | 45.83% | 6,023 | 49.99% | 503 | 4.17% |
1928 | 6,754 | 69.09% | 2,880 | 29.46% | 141 | 1.44% |
1924 | 4,869 | 63.69% | 1,271 | 16.63% | 1,505 | 19.69% |
1920 | 3,593 | 61.52% | 1,941 | 33.24% | 306 | 5.24% |
1916 | 2,040 | 36.60% | 3,368 | 60.42% | 166 | 2.98% |
1912 | 1,011 | 18.87% | 2,309 | 43.10% | 2,037 | 38.03% |
1908 | 2,623 | 48.58% | 2,583 | 47.84% | 193 | 3.57% |
1904 | 2,903 | 60.76% | 1,739 | 36.40% | 136 | 2.85% |
1900 | 1,807 | 44.79% | 2,138 | 53.00% | 89 | 2.21% |
1896 | 300 | 8.41% | 3,176 | 88.99% | 93 | 2.61% |
1892 | 792 | 42.86% | 0 | 0.00% | 1,056 | 57.14% |
1888 | 970 | 52.92% | 767 | 41.84% | 96 | 5.24% |
1884 | 845 | 50.97% | 743 | 44.81% | 70 | 4.22% |
1880 | 832 | 49.55% | 790 | 47.05% | 57 | 3.39% |
Douglas County is a county located in the U.S. state of Colorado. As of the 2020 Census, the population was 357,978. The county is named in honor of U.S. Senator Stephen A. Douglas. The county seat is Castle Rock.
Adams County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 519,572. The county seat is Brighton, and the largest city is Thornton. The county is named for Alva Adams, an early Governor of the State of Colorado in 1887–1889. Adams County is part of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area.
Denver is the central city of a conurbation region in the U.S. state of Colorado. The conurbation includes one continuous region consisting of the six central counties of Adams, Arapahoe, Broomfield, Denver, Douglas, and Jefferson. The Denver region is part of the Front Range Urban Corridor and its metropolitan planning organization is the Denver Regional Council of Governments.
Park County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 17,390. The county seat is Fairplay. The county was named after the large geographic region known as South Park, which was named by early fur traders and trappers in the area.
Arapahoe County is a county located in the U.S. state of Colorado. As of the 2020 census, its population was 655,070, making it the third-most populous county in Colorado. The county seat is Littleton, and the most populous city is Aurora. The county was named for the Arapaho Native American tribe, who once lived in the region.
Columbine is a census-designated place (CDP) in and governed by Jefferson and Arapahoe counties in Colorado, United States. The CDP is a part of the Denver metropolitan area. Located primarily in Jefferson County, Columbine lies immediately south of Denver. The population of the Columbine CDP was 25,229 at the 2020 census. The community lies in ZIP code 80123.
Aspen Park is an unincorporated community and a census-designated place (CDP) located in Jefferson County, Colorado, United States. The CDP is a part of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area. The population of the Aspen Park CDP was 810 at the United States Census 2020. The Aspen Park Metropolitan District provides services. The Conifer post office serves the area.
Evergreen is an unincorporated town, a post office, and a census-designated place (CDP) located in and governed by Jefferson County, Colorado, U.S. The CDP is a part of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area. The Evergreen post office has the ZIP Codes 80439 and 80437. At the 2020 census, the population of the Evergreen CDP was 9,307. The Evergreen Metropolitan District provides services.
Indian Hills is an unincorporated town, a post office, and a census-designated place (CDP) located in and governed by Jefferson County, Colorado, United States. The CDP is a part of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area. The Indian Hills post office has the ZIP code 80454. At the United States Census 2020, the population of the Indian Hills CDP was 1,474.
Ken Caryl, commonly known as Ken Caryl Ranch, is an unincorporated community and a census-designated place (CDP) located in and governed by Jefferson County, Colorado, United States. The CDP is a part of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area. The population of the Ken Caryl CDP was 33,811 at the 2020 census. The Ken Caryl Ranch Metropolitan District and the Ken Caryl Ranch Water District provide services. The Littleton post office serves the area.
West Pleasant View is an unincorporated community and a census-designated place (CDP) located in and governed by Jefferson County, Colorado, United States. The CDP is a part of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area. The population of the West Pleasant View CDP was 4,327 at the United States Census 2020. The Pleasant View Metropolitan District provides services. The Golden post office serves the area.
Centennial is a home rule municipality located in Arapahoe County, Colorado, United States. The city population was 108,418 at the 2020 United States Census, making Centennial the 11th most populous municipality in Colorado. Centennial is a part of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area and the Front Range Urban Corridor.
Jefferson County School District R-1 is a school district in Jefferson County, Colorado. The district is headquartered at the Jeffco Public Schools Education Center in an unincorporated area of the county near Golden in the Denver metropolitan area. Jeffco Public Schools serves almost 81,000 students in 166 schools. It is the second-largest school district in Colorado, having been surpassed in 2013 by Denver Public Schools, which has an enrollment of approximately 81,000.
Littleton is a home rule municipality city located in Arapahoe, Douglas, and Jefferson counties, Colorado, United States. Littleton is the county seat of Arapahoe County and is a part of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area. The city population was 45,652 at the 2020 United States Census, ranking as the 20th most populous municipality in Colorado.
Jefferson County was a county of the extralegal United States Territory of Jefferson that existed from November 28, 1859, until February 28, 1861. Its territory covered a broad swath surrounding the region of the Pike's Peak Gold Rush, and was a functioning democratically elected government until the organization of the Territory of Colorado in 1861. At that time, the successor Jefferson County was permanently created, taking its name from its predecessor and incorporating the heart of its territory.
This is an alphabetical list of articles related to the U.S. State of Colorado.
The following outline is provided as an overview of and topical guide to the U.S. state of Colorado:
Lakewood is the home rule municipality that is the most populous municipality in Jefferson County, Colorado, United States. The city population was 155,984 at the 2020 U.S. Census, making Lakewood the fifth most populous city in Colorado and the 167th most populous city in the United States. Lakewood is a suburb of Denver and is a principal city of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area and a major city of the Front Range Urban Corridor.
Bear Creek is a tributary of the South Platte River in central Colorado in the United States. It begins as a small creek up in the Mount Blue Sky Wilderness in Summit Lake and makes its way through Evergreen, CO, Kittredge, CO, Idledale, CO and Morrison, CO before entering Bear Creek Lake Park, managed by the City of Lakewood, Colorado.
The Front Range Urban Corridor is an oblong region of urban population located along the eastern face of the Southern Rocky Mountains, encompassing 18 counties in the US states of Colorado and Wyoming. The corridor derives its name from the Front Range, the mountain range that defines the western boundary of the corridor which serves as a gateway to the Rocky Mountains. The region comprises the northern portion of the Southern Rocky Mountain Front geographic area, which in turn comprises the southern portion of the Rocky Mountain Front geographic area of Canada and the United States. The Front Range Urban Corridor had a population of 5,055,344 at the 2020 Census, an increase of +16.65% since the 2010 Census.