34 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 6902 | Stamford | 72,915 |
| 6810 | Danbury | 55,179 |
| 6854 | Norwalk | 31,753 |
| 6811 | Danbury | 30,526 |
| 6851 | Norwalk | 28,591 |
| 6880 | Westport | 27,364 |
| 6776 | New Milford | 27,133 |
| 6877 | Ridgefield | 25,029 |
| 6830 | Greenwich | 24,919 |
| 6820 | Darien | 21,683 |
| 6840 | New Canaan | 20,704 |
| 6801 | Bethel | 20,498 |
| 6905 | Stamford | 20,126 |
| 6850 | Norwalk | 19,774 |
| 6897 | Wilton | 18,439 |
| 6804 | Brookfield | 17,871 |
| 6470 | Newtown | 15,576 |
| 6831 | Greenwich | 14,656 |
| 6903 | Stamford | 13,630 |
| 6812 | New Fairfield | 13,558 |
| 6482 | Sandy Hook | 11,808 |
| 6901 | Stamford | 10,506 |
| 6883 | Weston | 10,335 |
| 6906 | Stamford | 9,472 |
| 6907 | Stamford | 9,071 |
| 6896 | Redding | 8,719 |
| 6878 | Riverside | 8,446 |
| 6855 | Norwalk | 8,028 |
| 6870 | Old Greenwich | 7,903 |
| 6807 | Cos Cob | 7,667 |
| 6784 | Sherman | 3,525 |
| 6853 | Norwalk | 3,229 |
| 6752 | Bridgewater | 1,670 |
| 6755 | 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).