34 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 6902 | Stamford | 73,238 |
| 6810 | Danbury | 54,957 |
| 6854 | Norwalk | 32,228 |
| 6811 | Danbury | 31,170 |
| 6851 | Norwalk | 28,217 |
| 6880 | Westport | 27,331 |
| 6776 | New Milford | 27,318 |
| 6877 | Ridgefield | 25,059 |
| 6830 | Greenwich | 24,881 |
| 6820 | Darien | 21,571 |
| 6840 | New Canaan | 20,709 |
| 6801 | Bethel | 20,406 |
| 6905 | Stamford | 20,201 |
| 6850 | Norwalk | 19,286 |
| 6897 | Wilton | 18,473 |
| 6804 | Brookfield | 17,797 |
| 6470 | Newtown | 15,511 |
| 6831 | Greenwich | 14,681 |
| 6812 | New Fairfield | 13,596 |
| 6903 | Stamford | 13,266 |
| 6482 | Sandy Hook | 11,830 |
| 6883 | Weston | 10,336 |
| 6906 | Stamford | 10,057 |
| 6901 | Stamford | 9,599 |
| 6907 | Stamford | 8,948 |
| 6896 | Redding | 8,747 |
| 6878 | Riverside | 8,303 |
| 6870 | Old Greenwich | 8,096 |
| 6855 | Norwalk | 8,085 |
| 6807 | Cos Cob | 7,641 |
| 6784 | Sherman | 3,515 |
| 6853 | Norwalk | 3,160 |
| 6752 | Bridgewater | 1,709 |
| 6755 | Gaylordsville | 826 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 34 ZCTAs in Western CT Planning Region, Connecticut (US Census).