| ZIP Codes: | 45 ZIP Codes (38 Standard, 7 PO Box, 0 Unique) [See All] |
| Area Codes: | 339 / 508 / 617 / 774 / 781 / 857 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 11:53:45 PM |
| Population: | 720,686 [See All] |
| FIPS: | 25021 |
| CBSA: | Boston-Cambridge-Newton, MA-NH |
| Land Area: | 406 sq mi |
| Water Area: | 18 sq mi |
| Coordinates: | 42.1979, -71.1638 |
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720,686 residents live across 45 ZIPs covering 406 sq mi, served by 39 distinct USPS-recognized cities.
Population moved from 673,363 to 720,686 from 2014 to 2024 — a +7.0% change. 35 ZIPs gained residents, 4 lost.
The county's wealthiest ZIP 02481 (Wellesley Hills, $250,001 median) and poorest ZIP 02189 (East Weymouth, $94,541) are 19.0 miles apart — a 2.6× income gap across local geography.
Median home values vary 3.8× across this county — from $450,700 in 02019 (Bellingham) to $1,694,600 in 02481 (Wellesley Hills).
Density varies 63× across the county — from 383 people/sq mi in 02030 (Dover) to 24,061 in 02446 (Brookline).
Educational attainment ranges from 30.6% bachelor's+ in 02322 (Avon) to 90.6% in 02481 (Wellesley Hills) — the breadth of educational profiles across the area.
Within Massachusetts, this is the #5 most populous of 14 counties and ranks #1 for median household income with the #6 fastest decade growth .
On the national stage, Norfolk County is the #93 most populous US county , ranks #18 for income .
Weighted by population, the typical household earns about $142,332 across the county — reflecting what a typical resident sees, not a simple ZIP average.
58.5% of adults age 25+ hold a bachelor's degree or higher (299,659 of 512,400 reporting).
38 Standard delivery, 7 PO Box only, 0 single-entity Unique ZIPs serve this county.
18 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 02169 | Quincy | Standard | 62,993 | $96,290 | 9.1 | 13.7% |
| 02184 | Braintree | Standard | 38,899 | $122,214 | 14.5 | 6.4% |
| 02368 | Randolph | Standard | 34,912 | $109,665 | 9.8 | 5.0% |
| 02038 | Franklin | Standard | 33,154 | $145,773 | 27.0 | 2.3% |
| 02062 | Norwood | Standard | 31,542 | $107,030 | 10.6 | 9.4% |
| 02446 | Brookline | Standard | 31,310 | $131,963 | 1.3 | 8.7% |
| 02072 | Stoughton | Standard | 29,225 | $104,794 | 16.4 | 5.0% |
| 02186 | Milton | Standard | 28,735 | $188,033 | 17.0 | 5.6% |
| 02026 | Dedham | Standard | 25,237 | $128,955 | 10.5 | 0.5% |
| 02021 | Canton | Standard | 24,748 | $143,381 | 19.9 | 12.3% |
| 02445 | Brookline | Standard | 22,560 | $139,747 | 2.6 | 8.9% |
| 02492 | Needham | Standard | 21,424 | $226,645 | 9.3 | 6.3% |
| 02171 | Quincy | Standard | 20,164 | $106,885 | 2.8 | 10.8% |
| 02190 | South Weymouth | Standard | 19,695 | $99,657 | 7.6 | 18.2% |
| 02081 | Walpole | Standard | 19,343 | $156,250 | 17.7 | 2.6% |
| 02170 | Quincy | Standard | 18,809 | $103,627 | 2.1 | -2.6% |
| 02035 | Foxboro | Standard | 18,615 | $115,833 | 21.0 | 8.7% |
| 02067 | Sharon | Standard | 18,538 | $192,314 | 24.2 | 4.7% |
| 02481 | Wellesley Hills | Standard | 17,415 | $250,001 | 6.1 | 6.7% |
| 02019 | Bellingham | Standard | 17,410 | $125,307 | 18.9 | 5.1% |
| 02090 | Westwood | Standard | 16,318 | $223,125 | 11.1 | 10.2% |
| 02188 | Weymouth | Standard | 16,179 | $107,335 | 4.0 | 10.5% |
| 02189 | East Weymouth | Standard | 14,450 | $94,541 | 4.5 | -4.5% |
| 02053 | Medway | Standard | 13,436 | $173,750 | 11.7 | 3.6% |
| 02052 | Medfield | Standard | 13,068 | $235,800 | 14.6 | 6.8% |
| 02093 | Wrentham | Standard | 12,297 | $151,676 | 22.7 | 10.1% |
| 02056 | Norfolk | Standard | 11,673 | $200,720 | 15.4 | 2.3% |
| 02343 | Holbrook | Standard | 11,346 | $115,032 | 7.2 | 5.1% |
| 02482 | Wellesley | Standard | 11,051 | $226,250 | 4.4 | -1.4% |
| 02494 | Needham Heights | Standard | 11,035 | $179,720 | 2.8 | 17.7% |
| 02762 | Plainville | Standard | 9,943 | $104,106 | 11.5 | 15.9% |
| 02054 | Millis | Standard | 8,888 | $155,996 | 12.3 | 11.0% |
| 02025 | Cohasset | Standard | 8,427 | $199,306 | 9.8 | 4.0% |
| 02191 | North Weymouth | Standard | 8,181 | $120,324 | 2.1 | -2.4% |
| 02030 | Dover | Standard | 5,930 | $250,001 | 15.5 | 3.5% |
| 02032 | East Walpole | Standard | 4,992 | $180,682 | 2.4 | 21.7% |
| 02322 | Avon | Standard | 4,774 | $130,625 | 4.6 | 8.0% |
| 02071 | South Walpole | Standard | 2,089 | $213,885 | 1.0 | 9.3% |
| 02457 | Babson Park | PO Box | 1,881 | — | 0.0 | 41.0% |
| 02187 | Milton Village | PO Box | — | — | 0.0 | — |
| 02447 | Brookline Village | PO Box | — | — | 0.0 | — |
| 02070 | Sheldonville | PO Box | — | — | 0.0 | — |
| 02027 | Dedham | PO Box | — | — | 0.0 | — |
| 02269 | Quincy | PO Box | — | — | 0.0 | — |
| 02185 | Braintree | PO Box | — | — | 0.0 | — |