| Zip Code | City | Population ↓ |
|---|---|---|
| 14094 | Lockport | 50,302 |
| 14120 | North Tonawanda | 44,414 |
| 14304 | Niagara Falls | 28,582 |
| 14305 | Niagara Falls | 16,605 |
| 14301 | Niagara Falls | 12,151 |
| 14092 | Lewiston | 10,522 |
| 14132 | Sanborn | 6,689 |
| 14303 | Niagara Falls | 6,159 |
| 14174 | Youngstown | 5,698 |
| 14108 | Newfane | 5,263 |
| 14131 | Ransomville | 5,182 |
| 14105 | Middleport | 5,128 |
| 14067 | Gasport | 4,028 |
| 14172 | Wilson | 3,091 |
| 14012 | Barker | 3,020 |
| 14008 | Appleton | 1,594 |
| 14028 | Burt | 1,556 |
| 14109 | Niagara University | 1,218 |
| 14126 | Olcott | 456 |
| 14302 | Niagara Falls | 206 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 20 ZCTAs in Niagara County, New York (US Census).