The following highways are numbered 20A:
U.S. Route 20A (New York) 
County Road 20A (Putnam County, Florida) 
Massachusetts Route 20A 
Nebraska Highway 20A (former) 
New York State Route 20A (1930–1932) (former) New York State Route 20A (1938–1939) (former)| 0–9 | |
|---|---|
| 10–16 | |
| 17–22 | |
| 23–31 | |
| 32–44 | |
| 45–63 | |
| 64–85 | |
| 86–103 | |
| 104–125 | |
| 126–149 | |
| 150–174 | |
| 175–199 | |
| 200–224 | |
| 225–249 | |
| 250–274 | |
| 275–299 | |
| 300–324 | |
| 325–349 | |
| 350–374 | |
| 375–399 | |
| 400–424 | |
| 425–449 | |
| 450–474 | |
| 475–499 | |
| 500–524 | |
| 525–549 | |
| 550–574 | |
| 575–599 | |
| 600–624 | |
| 625–649 | |
| 650–674 | |
| 675–699 | |
| 700–724 | |
| 725–749 | |
| 750–774 | |
| 775–799 | |
| 800–824 | |
| 825–849 | |
| 850–874 | |
| 875–899 | |
| 900–924 | |
| 925–949 | |
| 950–974 | |
| 975–999 | |
| 1000+ | |
