| ZIP Codes: | 53 ZIP Codes (35 Standard, 9 PO Box, 9 Unique) [See All] |
| Area Codes: | 339 / 508 / 617 / 774 / 781 / 857 / 978 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 11:53:45 PM |
| Population: | 780,506 [See All] |
| FIPS: | 25025 |
| CBSA: | Boston-Cambridge-Newton, MA-NH |
| Land Area: | 60 sq mi |
| Water Area: | 7 sq mi |
| Coordinates: | 42.3400, -71.0716 |
| Quick Link: |
780,506 residents live across 53 ZIPs covering 60 sq mi, served by 19 distinct USPS-recognized cities.
Population moved from 743,318 to 780,444 from 2014 to 2024 — a +5.0% change. 19 ZIPs gained residents, 13 lost (and 1 held flat).
The county's wealthiest ZIP 02108 (Boston, $212,928 median) and poorest ZIP 02121 (Dorchester, $43,136) are 3.7 miles apart — a 4.9× income gap across local geography.
Median home values vary 3.4× across this county — from $493,500 in 02150 (Chelsea) to $1,667,600 in 02108 (Boston).
Density varies 11× across the county — from 5,348 people/sq mi in 02132 (West Roxbury) to 60,236 in 02113 (Boston).
Most of the decade's growth concentrated around Boston — top growth ZIPs averaged +99.2% over the past ten years ( 02210 , 02136 and 02110 ).
Educational attainment ranges from 19.9% bachelor's+ in 02121 (Dorchester) to 93.9% in 02199 (Boston) — the breadth of educational profiles across the area.
Within Massachusetts, this is the #4 most populous of 14 counties and ranks #8 for median household income with the #10 fastest decade growth .
On the national stage, Suffolk County is the #84 most populous US county .
Hosts 4 single-entity Unique ZIPs: 02201Boston City Hall ; 02204Massachusetts Tax ; 02241Fleet Bank Boston ; and 02206State Street Corporation .
Weighted by population, the typical household earns about $96,137 across the county — reflecting what a typical resident sees, not a simple ZIP average.
50.6% of adults age 25+ hold a bachelor's degree or higher (278,275 of 550,422 reporting). The most-educated ZIPs cluster around Boston.
35 Standard delivery, 9 PO Box only, 9 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.
9 ZIP codes in this county serve a single facility — typically theme parks, universities, large corporations, airports, or government complexes.
Median household income spans 4.9× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 02151 | Revere | Standard | 60,012 | $86,969 | 6.5 | 12.7% |
| 02124 | Dorchester Center | Standard | 56,216 | $81,923 | 3.2 | 9.1% |
| 02128 | East Boston | Standard | 43,345 | $90,106 | 5.2 | -2.6% |
| 02135 | Brighton | Standard | 43,149 | $90,829 | 2.8 | 18.3% |
| 02130 | Jamaica Plain | Standard | 40,055 | $131,551 | 3.7 | 4.8% |
| 02150 | Chelsea | Standard | 39,908 | $72,179 | 2.5 | 7.6% |
| 02136 | Hyde Park | Standard | 37,265 | $96,737 | 4.8 | 23.4% |
| 02127 | South Boston | Standard | 36,769 | $164,387 | 2.0 | 5.9% |
| 02125 | Dorchester | Standard | 33,662 | $82,953 | 2.3 | -0.8% |
| 02131 | Roslindale | Standard | 31,151 | $111,006 | 2.5 | -1.8% |
| 02115 | Boston | Standard | 29,705 | $54,991 | 0.7 | 0.8% |
| 02121 | Dorchester | Standard | 29,040 | $43,136 | 1.8 | 5.8% |
| 02118 | Boston | Standard | 28,946 | $98,224 | 1.1 | 5.1% |
| 02119 | Roxbury | Standard | 27,377 | $48,488 | 1.6 | 6.4% |
| 02126 | Mattapan | Standard | 26,583 | $65,709 | 2.2 | -6.0% |
| 02132 | West Roxbury | Standard | 26,444 | $138,724 | 4.9 | -8.2% |
| 02215 | Boston | Standard | 24,581 | $72,095 | 0.9 | 2.2% |
| 02122 | Dorchester | Standard | 23,479 | $86,150 | 2.1 | -8.3% |
| 02116 | Boston | Standard | 21,978 | $126,496 | 0.6 | -1.1% |
| 02129 | Charlestown | Standard | 20,032 | $157,247 | 1.6 | 11.6% |
| 02152 | Winthrop | Standard | 18,759 | $116,167 | 2.4 | 4.3% |
| 02134 | Allston | Standard | 17,667 | $78,679 | 1.3 | -3.3% |
| 02120 | Roxbury Crossing | Standard | 15,283 | $64,289 | 0.7 | 1.4% |
| 02114 | Boston | Standard | 14,418 | $132,210 | 0.6 | 12.6% |
| 02111 | Boston | Standard | 8,407 | $87,404 | 0.4 | 12.0% |
| 02210 | Boston | Standard | 6,971 | $172,124 | 1.0 | 251.4% |
| 02113 | Boston | Standard | 6,385 | $113,314 | 0.1 | -13.2% |
| 02108 | Boston | Standard | 3,794 | $212,928 | 0.1 | -6.3% |
| 02109 | Boston | Standard | 3,612 | $158,843 | 0.2 | -9.5% |
| 02110 | Boston | Standard | 2,342 | $138,438 | 0.2 | 22.9% |
| 02163 | Boston | Standard | 1,817 | $84,583 | 0.2 | -17.7% |
| 02199 | Boston | Standard | 1,292 | $122,285 | 0.1 | -4.9% |
| 02133 | Boston | Standard | 62 | — | 0.0 | — |
| 02205 | Boston | PO Box | 0 | — | 0.0 | — |
| 02203 | Boston | Standard | 0 | — | 0.0 | — |
| 02222 | Boston | Standard | — | — | 0.0 | — |
| 02204 | Boston | Unique | — | — | 0.0 | — |
| 02112 | Boston | PO Box | — | — | 0.0 | — |
| 02196 | Boston | PO Box | — | — | 0.0 | — |
| 02201 | Boston | Unique | — | — | 0.0 | — |
| 02241 | Boston | Unique | — | — | 0.0 | — |
| 02206 | Boston | Unique | — | — | 0.0 | — |
| 02212 | Boston | Unique | — | — | 0.0 | — |
| 02211 | Boston | Unique | — | — | 0.0 | — |
| 02297 | Boston | Unique | — | — | 0.0 | — |
| 02298 | Boston | PO Box | — | — | 0.0 | — |
| 02283 | Boston | PO Box | — | — | 0.0 | — |
| 02284 | Boston | PO Box | — | — | 0.0 | — |
| 02293 | Boston | Unique | — | — | 0.0 | — |
| 02123 | Boston | PO Box | — | — | 0.0 | — |
| 02137 | Readville | PO Box | — | — | 0.0 | — |
| 02217 | Boston | Unique | — | — | 0.0 | — |
| 02117 | Boston | PO Box | — | — | 0.0 | — |