| Zip Code | City | Population ↓ |
|---|---|---|
| 53051 | Menomonee Falls | 38,639 |
| 53066 | Oconomowoc | 36,973 |
| 53188 | Waukesha | 34,078 |
| 53186 | Waukesha | 33,672 |
| 53151 | New Berlin | 32,507 |
| 53072 | Pewaukee | 26,653 |
| 53189 | Waukesha | 26,640 |
| 53150 | Muskego | 26,047 |
| 53045 | Brookfield | 23,292 |
| 53005 | Brookfield | 21,624 |
| 53029 | Hartland | 21,325 |
| 53089 | Sussex | 19,817 |
| 53149 | Mukwonago | 19,533 |
| 53018 | Delafield | 7,813 |
| 53146 | New Berlin | 7,746 |
| 53118 | Dousman | 7,154 |
| 53122 | Elm Grove | 6,461 |
| 53119 | Eagle | 5,717 |
| 53103 | Big Bend | 3,621 |
| 53058 | Nashotah | 3,177 |
| 53183 | Wales | 3,081 |
| 53153 | North Prairie | 2,740 |
| 53007 | Butler | 1,906 |
| 53046 | Lannon | 1,351 |
| 53069 | Okauchee | 654 |
| 53127 | Genesee Depot | 124 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 26 ZCTAs in Waukesha County, Wisconsin (US Census).