| ZIP Codes: | 56 ZIP Codes (42 Standard, 10 PO Box, 4 Unique) [See All] |
| Area Codes: | 339 / 351 / 508 / 617 / 781 / 978 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 11:53:45 PM |
| Population: | 812,999 [See All] |
| FIPS: | 25009 |
| CBSA: | Boston-Cambridge-Newton, MA-NH |
| Land Area: | 522 sq mi |
| Water Area: | 63 sq mi |
| Coordinates: | 42.6368, -70.9677 |
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812,999 residents live across 56 ZIPs covering 522 sq mi, served by 39 distinct USPS-recognized cities.
Population moved from 757,770 to 812,328 from 2014 to 2024 — a +7.2% change. 36 ZIPs gained residents, 7 lost.
The county's wealthiest ZIP 01944 (Manchester, $206,389 median) and poorest ZIP 01901 (Lynn, $36,119) are 12.5 miles apart — a 5.7× income gap across local geography.
Median home values vary 2.3× across this county — from $403,400 in 01841 (Lawrence) to $942,200 in 01945 (Marblehead).
Density varies 121× across the county — from 172 people/sq mi in 01951 (Newbury) to 20,910 in 01902 (Lynn).
Educational attainment ranges from 14.7% bachelor's+ in 01841 (Lawrence) to 78.3% in 01944 (Manchester) — the breadth of educational profiles across the area.
Within Massachusetts, this is the #3 most populous of 14 counties and ranks #5 for median household income with the #5 fastest decade growth .
On the national stage, Essex County is the #78 most populous US county , ranks #63 for income .
Hosts 4 single-entity Unique ZIPs: 01910General Elec Co ; 01899Bar Coded Irs ; 05501Internal Revenue Service ; and 01812Internal Revenue Service .
Weighted by population, the typical household earns about $109,263 across the county — reflecting what a typical resident sees, not a simple ZIP average.
43.0% of adults age 25+ hold a bachelor's degree or higher (246,142 of 572,000 reporting).
42 Standard delivery, 10 PO Box only, 4 single-entity Unique ZIPs serve this county.
16 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
4 ZIP codes in this county serve a single facility — typically theme parks, universities, large corporations, airports, or government complexes.
Median household income spans 5.7× 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 |
|---|---|---|---|---|---|---|
| 01960 | Peabody | Standard | 54,474 | $96,501 | 16.6 | 5.6% |
| 01844 | Methuen | Standard | 53,420 | $113,212 | 22.8 | 10.9% |
| 01841 | Lawrence | Standard | 52,769 | $56,971 | 3.2 | 12.0% |
| 01902 | Lynn | Standard | 50,066 | $67,046 | 2.4 | 8.6% |
| 01970 | Salem | Standard | 44,738 | $85,041 | 8.7 | 6.1% |
| 01915 | Beverly | Standard | 41,994 | $104,918 | 15.5 | 4.0% |
| 01810 | Andover | Standard | 35,648 | $172,606 | 32.2 | 4.1% |
| 01845 | North Andover | Standard | 32,494 | $140,670 | 28.1 | 12.2% |
| 01930 | Gloucester | Standard | 30,075 | $83,883 | 28.5 | 2.9% |
| 01906 | Saugus | Standard | 28,773 | $101,539 | 11.5 | 5.1% |
| 01905 | Lynn | Standard | 28,221 | $84,333 | 4.1 | 11.7% |
| 01923 | Danvers | Standard | 27,991 | $125,395 | 14.2 | 3.8% |
| 01843 | Lawrence | Standard | 27,445 | $67,585 | 3.6 | 7.9% |
| 01830 | Haverhill | Standard | 26,530 | $78,571 | 14.9 | 0.4% |
| 01832 | Haverhill | Standard | 26,386 | $83,041 | 11.8 | 19.2% |
| 01904 | Lynn | Standard | 21,003 | $99,614 | 4.6 | 16.3% |
| 01945 | Marblehead | Standard | 20,470 | $179,583 | 4.4 | 1.5% |
| 01950 | Newburyport | Standard | 18,652 | $139,625 | 10.7 | 5.6% |
| 01913 | Amesbury | Standard | 17,403 | $103,554 | 13.7 | 5.1% |
| 01907 | Swampscott | Standard | 15,277 | $134,386 | 3.0 | 8.2% |
| 01835 | Haverhill | Standard | 14,782 | $113,578 | 8.7 | 11.8% |
| 01938 | Ipswich | Standard | 13,930 | $138,750 | 32.9 | 3.3% |
| 01940 | Lynnfield | Standard | 13,285 | $173,214 | 10.6 | 4.6% |
| 01949 | Middleton | Standard | 9,816 | $167,402 | 14.4 | 5.9% |
| 01952 | Salisbury | Standard | 9,281 | $93,361 | 17.2 | 9.3% |
| 01840 | Lawrence | Standard | 8,522 | $42,211 | 0.6 | 77.6% |
| 01833 | Georgetown | Standard | 8,432 | $153,750 | 13.1 | 0.6% |
| 01921 | Boxford | Standard | 8,250 | $200,672 | 24.0 | 1.8% |
| 01982 | South Hamilton | Standard | 7,680 | $132,571 | 14.9 | -5.2% |
| 01966 | Rockport | Standard | 7,009 | $96,250 | 7.0 | -1.0% |
| 01834 | Groveland | Standard | 6,777 | $141,487 | 9.4 | -0.4% |
| 01860 | Merrimac | Standard | 6,748 | $123,054 | 8.8 | 3.2% |
| 01983 | Topsfield | Standard | 6,564 | $195,718 | 12.9 | 4.4% |
| 01969 | Rowley | Standard | 6,251 | $132,734 | 17.9 | 4.3% |
| 01944 | Manchester | Standard | 5,403 | $206,389 | 7.7 | 3.0% |
| 01984 | Wenham | Standard | 4,929 | $194,781 | 8.1 | -2.2% |
| 01985 | West Newbury | Standard | 4,591 | $179,500 | 15.0 | 5.1% |
| 01929 | Essex | Standard | 3,621 | $156,442 | 13.5 | 1.1% |
| 01922 | Byfield | Standard | 3,450 | $142,207 | 9.1 | 30.2% |
| 01951 | Newbury | Standard | 3,327 | $182,684 | 19.3 | -19.7% |
| 01908 | Nahant | Standard | 3,325 | $112,762 | 1.3 | -3.7% |
| 01901 | Lynn | Standard | 2,419 | $36,119 | 0.3 | 33.9% |
| 01965 | Prides Crossing | PO Box | 671 | $250,001 | 0.2 | — |
| 01937 | Hathorne | PO Box | 107 | — | 0.0 | -4.5% |
| 01931 | Gloucester | PO Box | — | — | 0.0 | — |
| 01936 | Hamilton | PO Box | — | — | 0.0 | — |
| 01899 | Andover | Unique | — | — | 0.0 | — |
| 05501 | Andover | Unique | — | — | 0.0 | — |
| 01812 | Andover | Unique | — | — | 0.0 | — |
| 01961 | Peabody | PO Box | — | — | 0.0 | — |
| 01971 | Salem | PO Box | — | — | 0.0 | — |
| 01903 | Lynn | PO Box | — | — | 0.0 | — |
| 01910 | Lynn | Unique | — | — | 0.1 | — |
| 01831 | Haverhill | PO Box | — | — | 0.0 | — |
| 01842 | Lawrence | PO Box | — | — | 0.0 | — |
| 01885 | West Boxford | PO Box | — | — | 0.0 | — |