34 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 06902 | Stamford | 72,915 |
| 06810 | Danbury | 55,179 |
| 06854 | Norwalk | 31,753 |
| 06811 | Danbury | 30,526 |
| 06851 | Norwalk | 28,591 |
| 06880 | Westport | 27,364 |
| 06776 | New Milford | 27,133 |
| 06877 | Ridgefield | 25,029 |
| 06830 | Greenwich | 24,919 |
| 06820 | Darien | 21,683 |
| 06840 | New Canaan | 20,704 |
| 06801 | Bethel | 20,498 |
| 06905 | Stamford | 20,126 |
| 06850 | Norwalk | 19,774 |
| 06897 | Wilton | 18,439 |
| 06804 | Brookfield | 17,871 |
| 06470 | Newtown | 15,576 |
| 06831 | Greenwich | 14,656 |
| 06903 | Stamford | 13,630 |
| 06812 | New Fairfield | 13,558 |
| 06482 | Sandy Hook | 11,808 |
| 06901 | Stamford | 10,506 |
| 06883 | Weston | 10,335 |
| 06906 | Stamford | 9,472 |
| 06907 | Stamford | 9,071 |
| 06896 | Redding | 8,719 |
| 06878 | Riverside | 8,446 |
| 06855 | Norwalk | 8,028 |
| 06870 | Old Greenwich | 7,903 |
| 06807 | Cos Cob | 7,667 |
| 06784 | Sherman | 3,525 |
| 06853 | Norwalk | 3,229 |
| 06752 | Bridgewater | 1,670 |
| 06755 | Gaylordsville | 975 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 34 ZCTAs in Western CT Planning Region, Connecticut (US Census).