| Zip Code | City | Population ↓ |
|---|---|---|
| 12901 | Plattsburgh | 32,431 |
| 12972 | Peru | 7,049 |
| 12962 | Morrisonville | 5,051 |
| 12992 | West Chazy | 3,774 |
| 12929 | Dannemora | 3,433 |
| 12921 | Chazy | 2,870 |
| 12919 | Champlain | 2,716 |
| 12918 | Cadyville | 2,607 |
| 12979 | Rouses Point | 2,534 |
| 12981 | Saranac | 2,397 |
| 12910 | Altona | 1,886 |
| 12958 | Mooers | 1,829 |
| 12912 | Au Sable Forks | 1,809 |
| 12903 | Plattsburgh | 1,705 |
| 12959 | Mooers Forks | 1,618 |
| 12935 | Ellenburg Depot | 1,406 |
| 12934 | Ellenburg Center | 1,197 |
| 12985 | Schuyler Falls | 915 |
| 12923 | Churubusco | 506 |
| 12955 | Lyon Mountain | 345 |
| 12924 | Keeseville | 325 |
| 12952 | Lyon Mountain | 265 |
| 12978 | Redford | 256 |
| 12933 | Ellenburg | 27 |
| 12911 | Keeseville | 0 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 25 ZCTAs in Clinton County, New York (US Census).