| ZIP Codes: | 41 ZIP Codes (30 Standard, 11 PO Box, 0 Unique) [See All] |
| Area Codes: | 315 / 680 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:13:15 PM |
| Population: | 116,437 [See All] |
| FIPS: | 36045 |
| CBSA: | Watertown-Fort Drum, NY |
| Land Area: | 1,389 sq mi |
| Water Area: | 62 sq mi |
| Coordinates: | 44.0417, -75.9263 |
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116,437 residents live across 41 ZIPs covering 1,389 sq mi, served by 39 distinct USPS-recognized cities.
Population moved from 120,514 to 116,172 from 2014 to 2024 — a -3.6% change. 15 ZIPs gained residents, 22 lost.
The county's wealthiest ZIP 13679 (Redwood, $101,932 median) and poorest ZIP 13616 (Calcium, $45,962) are 20.4 miles apart — a 2.2× income gap across local geography.
Median home values vary 2.5× across this county — from $111,600 in 13608 (Antwerp) to $283,400 in 13685 (Sackets Harbor).
Density varies 204× across the county — from 17 people/sq mi in 13679 (Redwood) to 3,499 in 13603 (Watertown).
Educational attainment ranges from 7.6% bachelor's+ in 13616 (Calcium) to 42.2% in 13685 (Sackets Harbor) — the breadth of educational profiles across the area.
Within New York, this is the #25 most populous of 62 counties and ranks #19 for median household income .
Weighted by population, the typical household earns about $68,445 across the county — reflecting what a typical resident sees, not a simple ZIP average.
26.2% of adults age 25+ hold a bachelor's degree or higher (19,668 of 75,133 reporting).
30 Standard delivery, 11 PO Box only, 0 single-entity Unique ZIPs serve this county.
A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 13601 | Watertown | Standard | 36,839 | $58,791 | 142.9 | -3.9% |
| 13603 | Watertown | Standard | 14,136 | $62,500 | 4.0 | 31.8% |
| 13619 | Carthage | Standard | 10,578 | $63,120 | 142.6 | -1.2% |
| 13605 | Adams | Standard | 5,259 | $70,045 | 78.2 | 7.2% |
| 13637 | Evans Mills | Standard | 5,212 | $57,103 | 40.6 | 32.1% |
| 13624 | Clayton | Standard | 4,650 | $87,988 | 64.1 | -17.5% |
| 13634 | Dexter | Standard | 3,570 | $92,109 | 47.9 | -26.8% |
| 13691 | Theresa | Standard | 2,990 | $79,943 | 68.1 | 1.4% |
| 13656 | La Fargeville | Standard | 2,942 | $72,500 | 87.3 | 1.6% |
| 13612 | Black River | Standard | 2,865 | $85,658 | 18.9 | -1.3% |
| 13606 | Adams Center | Standard | 2,468 | $88,977 | 35.1 | -20.4% |
| 13602 | Fort Drum | Standard | 2,440 | — | 28.6 | -32.8% |
| 13685 | Sackets Harbor | Standard | 2,362 | $79,469 | 18.8 | 2.4% |
| 13673 | Philadelphia | Standard | 2,097 | $81,167 | 59.6 | -5.9% |
| 13607 | Alexandria Bay | Standard | 2,020 | $66,500 | 24.6 | 11.6% |
| 13661 | Mannsville | Standard | 1,908 | $82,297 | 48.1 | 13.8% |
| 13622 | Chaumont | Standard | 1,859 | $81,065 | 55.5 | -37.6% |
| 13618 | Cape Vincent | Standard | 1,771 | $61,494 | 47.9 | -1.3% |
| 13608 | Antwerp | Standard | 1,676 | $73,643 | 70.0 | 11.6% |
| 13616 | Calcium | Standard | 1,430 | $45,962 | 5.6 | -34.5% |
| 13650 | Henderson | Standard | 1,236 | $94,318 | 43.6 | -13.7% |
| 13679 | Redwood | Standard | 1,205 | $101,932 | 70.2 | -33.4% |
| 13682 | Rodman | Standard | 854 | $79,821 | 31.1 | -4.7% |
| 13615 | Brownville | PO Box | 700 | $101,563 | 0.7 | -37.2% |
| 13665 | Natural Bridge | Standard | 465 | $51,250 | 44.0 | -67.1% |
| 13693 | Three Mile Bay | Standard | 423 | $72,396 | 21.2 | -20.8% |
| 13659 | Lorraine | Standard | 386 | $63,125 | 62.8 | -32.0% |
| 13628 | Deferiet | PO Box | 330 | $58,125 | 1.1 | 56.4% |
| 13640 | Wellesley Island | Standard | 318 | $118,026 | 16.1 | 10.4% |
| 13692 | Thousand Island Park | PO Box | 222 | $190,250 | 0.3 | 184.6% |
| 13643 | Great Bend | PO Box | 193 | $100,625 | 0.0 | 168.1% |
| 13674 | Pierrepont Manor | PO Box | 178 | — | 0.0 | 50.8% |
| 13638 | Felts Mills | Standard | 157 | $62,955 | 1.1 | -39.6% |
| 13611 | Belleville | PO Box | 147 | $70,139 | 2.9 | — |
| 13651 | Henderson Harbor | PO Box | 147 | $116,705 | 1.3 | -20.5% |
| 13636 | Ellisburg | Standard | 141 | $58,882 | 1.3 | -50.7% |
| 13632 | Depauville | PO Box | 118 | $132,857 | 0.6 | — |
| 13641 | Fishers Landing | PO Box | 91 | $61,458 | 0.4 | 85.7% |
| 13675 | Plessis | Standard | 54 | $208,182 | 1.7 | -39.3% |
| 13657 | Limerick | PO Box | — | — | 0.0 | — |
| 13671 | Antwerp | PO Box | — | — | 0.0 | — |