| ZIP Codes: | 31 ZIP Codes (25 Standard, 6 PO Box, 0 Unique) [See All] |
| Area Codes: | 262 / 274 / 414 / 920 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:14:21 PM |
| Population: | 416,773 [See All] |
| FIPS: | 55133 |
| CBSA: | Milwaukee-Waukesha, WI |
| Land Area: | 632 sq mi |
| Water Area: | 32 sq mi |
| Coordinates: | 43.0411, -88.2661 |
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416,773 residents live across 31 ZIPs covering 632 sq mi, served by 24 distinct USPS-recognized cities.
Population moved from 397,294 to 416,694 from 2014 to 2024 — a +4.9% change. 21 ZIPs gained residents, 4 lost.
The county's wealthiest ZIP 53122 (Elm Grove, $157,962 median) and poorest ZIP 53007 (Butler, $60,000) are 4.1 miles apart — a 2.6× income gap across local geography.
Median home values vary 2.4× across this county — from $244,700 in 53007 (Butler) to $584,900 in 53058 (Nashotah).
Density varies 19× across the county — from 139 people/sq mi in 53119 (Eagle) to 2,681 in 53186 (Waukesha).
Educational attainment ranges from 22.7% bachelor's+ in 53007 (Butler) to 74.2% in 53122 (Elm Grove) — the breadth of educational profiles across the area.
Within Wisconsin, this is the #3 most populous of 73 counties and ranks #1 for median household income .
Weighted by population, the typical household earns about $107,416 across the county — reflecting what a typical resident sees, not a simple ZIP average.
48.6% of adults age 25+ hold a bachelor's degree or higher (145,071 of 298,564 reporting). The most-educated ZIPs cluster around Brookfield.
25 Standard delivery, 6 PO Box only, 0 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 53051 | Menomonee Falls | Standard | 39,559 | $100,031 | 33.8 | 10.3% |
| 53066 | Oconomowoc | Standard | 37,558 | $113,114 | 112.4 | 9.9% |
| 53188 | Waukesha | Standard | 34,892 | $92,409 | 26.6 | 1.4% |
| 53186 | Waukesha | Standard | 33,374 | $74,588 | 12.4 | -4.3% |
| 53151 | New Berlin | Standard | 32,824 | $101,176 | 17.9 | 2.6% |
| 53189 | Waukesha | Standard | 26,855 | $117,008 | 48.5 | 1.6% |
| 53150 | Muskego | Standard | 26,259 | $109,276 | 37.8 | 4.7% |
| 53072 | Pewaukee | Standard | 26,200 | $98,538 | 33.5 | 6.7% |
| 53045 | Brookfield | Standard | 23,329 | $123,750 | 14.6 | 9.6% |
| 53029 | Hartland | Standard | 21,778 | $108,152 | 41.5 | 3.7% |
| 53005 | Brookfield | Standard | 21,675 | $126,739 | 14.8 | 9.8% |
| 53089 | Sussex | Standard | 20,588 | $120,875 | 27.3 | 11.5% |
| 53149 | Mukwonago | Standard | 19,614 | $110,608 | 61.7 | 3.8% |
| 53018 | Delafield | Standard | 8,201 | $124,595 | 12.8 | 2.5% |
| 53118 | Dousman | Standard | 7,554 | $108,772 | 39.3 | 5.3% |
| 53146 | New Berlin | Standard | 7,285 | $110,035 | 18.4 | -4.2% |
| 53122 | Elm Grove | Standard | 6,508 | $157,962 | 3.3 | 7.0% |
| 53119 | Eagle | Standard | 5,803 | $117,759 | 41.6 | 2.4% |
| 53103 | Big Bend | Standard | 3,762 | $137,083 | 13.6 | -3.8% |
| 53058 | Nashotah | Standard | 3,405 | $104,444 | 6.5 | -2.4% |
| 53183 | Wales | Standard | 3,111 | $108,827 | 3.6 | 7.7% |
| 53153 | North Prairie | Standard | 2,548 | $152,543 | 6.0 | 11.8% |
| 53007 | Butler | Standard | 1,859 | $60,000 | 0.8 | 6.5% |
| 53046 | Lannon | Standard | 1,482 | $83,889 | 2.4 | 30.1% |
| 53069 | Okauchee | Standard | 671 | $130,722 | 0.7 | 28.1% |
| 53127 | Genesee Depot | PO Box | 79 | — | 0.0 | — |
| 53008 | Brookfield | PO Box | — | — | 0.0 | — |
| 53187 | Waukesha | PO Box | — | — | 0.0 | — |
| 53056 | Merton | PO Box | — | — | 0.2 | — |
| 53064 | North Lake | PO Box | — | — | 0.0 | — |
| 53052 | Menomonee Falls | PO Box | — | — | 0.0 | — |