| ZIP Codes: | 19 ZIP Codes (13 Standard, 5 PO Box, 1 Unique) [See All] |
| Area Codes: | 223 / 717 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:13:31 PM |
| Population: | 269,697 [See All] |
| FIPS: | 42041 |
| CBSA: | Harrisburg-Carlisle, PA |
| Land Area: | 576 sq mi |
| Water Area: | 5 sq mi |
| Coordinates: | 40.1971, -77.1403 |
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269,697 residents live across 19 ZIPs covering 576 sq mi, served by 15 distinct USPS-recognized cities.
Population moved from 241,491 to 269,697 from 2014 to 2024 — a +11.7% change. 12 ZIPs gained residents, 4 lost.
The county's wealthiest ZIP 17007 (Boiling Springs, $117,130 median) and poorest ZIP 17043 (Lemoyne, $61,173) are 13.6 miles apart — a 1.9× income gap across local geography.
Median home values vary 1.8× across this county — from $211,300 in 17065 (Mount Holly Springs) to $385,600 in 17007 (Boiling Springs).
Density varies 5528× across the county — from 62 people/sq mi in 17240 (Newburg) to 341,585 in 17027 (Grantham).
Most of the decade's growth concentrated around Mechanicsburg — top growth ZIPs averaged +20.9% over the past ten years ( 17050 , 17055 and 17027 ).
Educational attainment ranges from 15.4% bachelor's+ in 17240 (Newburg) to 54.0% in 17050 (Mechanicsburg) — the breadth of educational profiles across the area.
Within Pennsylvania, this is the #16 most populous of 67 counties and ranks #13 for median household income with the #1 fastest decade growth .
Hosts 1 single-entity Unique ZIP: 17089High Mark Blue Shield .
Weighted by population, the typical household earns about $89,885 across the county — reflecting what a typical resident sees, not a simple ZIP average.
39.7% of adults age 25+ hold a bachelor's degree or higher (74,426 of 187,337 reporting). The most-educated ZIPs cluster around Mechanicsburg.
13 Standard delivery, 5 PO Box only, 1 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 17050 | Mechanicsburg | Standard | 43,571 | $113,720 | 35.9 | 25.9% |
| 17055 | Mechanicsburg | Standard | 42,006 | $99,077 | 39.2 | 20.6% |
| 17011 | Camp Hill | Standard | 39,664 | $92,556 | 14.1 | 12.8% |
| 17013 | Carlisle | Standard | 38,513 | $71,042 | 40.2 | 10.0% |
| 17257 | Shippensburg | Standard | 29,204 | $71,181 | 109.1 | 0.7% |
| 17015 | Carlisle | Standard | 24,385 | $86,981 | 113.3 | 15.1% |
| 17025 | Enola | Standard | 17,648 | $91,285 | 16.4 | 3.0% |
| 17241 | Newville | Standard | 11,181 | $75,500 | 124.7 | -2.9% |
| 17007 | Boiling Springs | Standard | 5,865 | $117,130 | 17.4 | 7.9% |
| 17043 | Lemoyne | Standard | 5,852 | $61,173 | 2.8 | -2.5% |
| 17065 | Mount Holly Springs | Standard | 4,389 | $86,406 | 9.4 | 1.1% |
| 17240 | Newburg | Standard | 3,241 | $91,429 | 52.5 | 1.8% |
| 17027 | Grantham | PO Box | 2,801 | $86,513 | 0.0 | 16.1% |
| 17093 | Summerdale | PO Box | 684 | $75,926 | 0.0 | -26.0% |
| 17266 | Walnut Bottom | Standard | 445 | $66,667 | 1.3 | -23.1% |
| 17081 | Plainfield | PO Box | 248 | $73,977 | 0.0 | 72.2% |
| 17089 | Camp Hill | Unique | — | — | 0.0 | — |
| 17072 | New Kingstown | PO Box | — | — | 0.0 | — |
| 17001 | Camp Hill | PO Box | — | — | 0.0 | — |