| ZIP Codes: | 13 ZIP Codes (10 Standard, 3 PO Box, 0 Unique) [See All] |
| Area Codes: | 615 / 629 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:13:50 PM |
| Population: | 248,976 [See All] |
| FIPS: | 47187 |
| CBSA: | Nashville-Davidson--Murfreesboro--Franklin, TN |
| Land Area: | 600 sq mi |
| Water Area: | 1 sq mi |
| Coordinates: | 35.9143, -86.8590 |
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248,976 residents live across 13 ZIPs covering 600 sq mi, served by 8 distinct USPS-recognized cities.
Population moved from 187,393 to 248,976 from 2014 to 2024 — a +32.9% change. 10 ZIPs gained residents, 0 lost.
The county's wealthiest ZIP 37046 (College Grove, $178,228 median) and poorest ZIP 38476 (Primm Springs, $83,654) are 27.7 miles apart — a 2.1× income gap across local geography.
Median home values vary 2.6× across this county — from $379,600 in 37062 (Fairview) to $979,900 in 37046 (College Grove).
Density varies 35× across the county — from 30 people/sq mi in 38476 (Primm Springs) to 1,043 in 37027 (Brentwood).
Educational attainment ranges from 33.4% bachelor's+ in 37062 (Fairview) to 74.2% in 37069 (Franklin) — the breadth of educational profiles across the area.
Within Tennessee, this is the #6 most populous of 95 counties and ranks #1 for median household income with the #4 fastest decade growth .
On the national stage, Williamson County is ranks #54 for income , and #45 for decade growth .
Weighted by population, the typical household earns about $136,466 across the county — reflecting what a typical resident sees, not a simple ZIP average.
64.3% of adults age 25+ hold a bachelor's degree or higher (107,674 of 167,568 reporting).
10 Standard delivery, 3 PO Box only, 0 single-entity Unique ZIPs serve this county.
6 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
Williamson County grew 32.9% over the past decade — concentrated in 5 high-growth ZIPs:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 37064 | Franklin | Standard | 67,513 | $127,771 | 186.7 | 29.2% |
| 37027 | Brentwood | Standard | 61,630 | $154,578 | 59.1 | 18.9% |
| 37067 | Franklin | Standard | 31,556 | $111,759 | 31.4 | 30.8% |
| 37135 | Nolensville | Standard | 24,409 | $148,819 | 36.6 | 144.1% |
| 37069 | Franklin | Standard | 20,209 | $157,939 | 37.0 | 0.2% |
| 37179 | Thompsons Station | Standard | 18,043 | $136,188 | 53.0 | 67.3% |
| 37062 | Fairview | Standard | 13,851 | $91,750 | 62.0 | 28.8% |
| 37046 | College Grove | Standard | 7,310 | $178,228 | 70.4 | 73.8% |
| 37014 | Arrington | Standard | 3,227 | $105,125 | 22.6 | 33.9% |
| 38476 | Primm Springs | Standard | 1,228 | $83,654 | 41.0 | 41.6% |
| 37068 | Franklin | PO Box | — | — | 0.0 | — |
| 37065 | Franklin | PO Box | — | — | 0.0 | — |
| 37024 | Brentwood | PO Box | — | — | 0.0 | — |