This is a list of settlements in Buckinghamshire by population based on the results of the 2021 census. The next United Kingdom census will take place in 2031. In 2021, there were 25 built-up area subdivisions with 5,000 or more inhabitants in Buckinghamshire, shown in the table below.
| # | Settlement | Unitary Authority | Population [1] [2] [3] | |||
|---|---|---|---|---|---|---|
| 2001 | 2011 | 2021 | Change (2011-2021) (%) | |||
| 1 | Milton Keynes | Milton Keynes | 135,661 | 170,866 | 197,340 | +15.5% |
| 2 | Aylesbury | Buckinghamshire | 65,973 | 72,490 | 87,950 | +21.3% |
| 3 | High Wycombe | Buckinghamshire | 68,510 | 75,858 | 83,950 | +10.7% |
| 4 | Bletchley | Milton Keynes | 34,540 | 37,119 | 45,010 | +21.3% |
| 5 | Chesham | Buckinghamshire | 20,896 | 22,058 | 23,695 | +7.4% |
| 6 | Hazlemere | Buckinghamshire | 20,201 | 20,310 | 20,005 | −1.5% |
| 7 | Amersham | Buckinghamshire | 15,554 | 16,733 | 17,380 | +3.9% |
| 8 | Newport Pagnell | Milton Keynes | 14,426 | 14,785 | 15,250 | +3.1% |
| 9 | Marlow | Buckinghamshire | 13,958 | 14,211 | 14,645 | +3.1% |
| 10 | Buckingham | Buckinghamshire | 11,572 | 12,043 | 14,295 | +18.7% |
| 11 | Beaconsfield | Buckinghamshire | 12,312 | 13,839 | 14,145 | +2.2% |
| 12 | Chalfont St Peter | Buckinghamshire | 12,659 | 13,034 | 13,050 | +0.1% |
| 13 | Flackwell Heath | Buckinghamshire | 11,831 | 12,373 | 12,435 | +0.5% |
| 14 | Wendover | Buckinghamshire | 7,630 | 7,416 | 8,730 | +17.7% |
| 15 | Gerrard's Cross | Buckinghamshire | 6,923 | 7,599 | 8,135 | +7.1% |
| 16 | Prestwood | Buckinghamshire | 7,577 | 7,747 | 7,595 | −2.0% |
| 17 | Princes Risborough | Buckinghamshire | 6,923 | 7,062 | 7,530 | +6.6% |
| 18 | Bourne End | Buckinghamshire | 6,634 | 6,809 | 7,170 | +5.3% |
| 19 | Farnham Common | Buckinghamshire | 5,766 | 6,310 | 6,715 | +6.4% |
| 20 | Olney | Milton Keynes | 6,032 | 6,477 | 6,600 | +1.9% |
| 21 | Little Chalfont | Buckinghamshire | 5,297 | 5,622 | 6,505 | +15.7% |
| 22 | Haddenham | Buckinghamshire | 4,720 | 4,391 | 5,605 | +27.6% |
| 23 | Aston Clinton | Buckinghamshire | 4,030 | 4,216 | 5,510 | +30.7% |
| 24 | Winslow | Buckinghamshire | 4,519 | 4,407 | 5,235 | +18.8% |
| 25 | Iver Heath | Buckinghamshire | 4,677 | 5,009 | 5,150 | +2.8% |
