Montgomery County, PA: Cities, ZIP Codes & Population
Montgomery County is a county-level area in Pennsylvania identified by the FIPS code 42091. Our data lists 52 places in it, led by Pottstown, PA, with combined estimates of about 433,740 people across those places. This page shows its cities, ZIP codes, time zone and neighboring counties.
What are the key facts about Montgomery County?
| County | Montgomery County |
|---|---|
| State | Pennsylvania |
| FIPS code | 42091 |
| Places in our data | 52 |
| Places with a city page | 27 |
| Combined place estimates | 433,740 |
| Largest place | Pottstown, PA (108,758) |
| Rank in state | 8th of 67 counties by combined place population |
| Weighted density | 4,624 per sq mi |
| Time zone | Eastern time |
| ZIP codes | 53 |
Which cities and towns are in Montgomery County?
Montgomery County has 27 places large enough for a full page on this site. They are ranked below by estimated population, together with whether each is incorporated, its density in people per square mile and the number of ZIP codes it uses. Pottstown, PA is the largest, followed by Norristown, PA.
| Place | Type | Population | Per sq mi | ZIPs |
|---|---|---|---|---|
| Pottstown, PA | Incorporated | 108,758 | 4,657 | 1 |
| Norristown, PA | Incorporated | 34,341 | 9,767 | 4 |
| King of Prussia, PA | Unincorporated / CDP | 21,313 | 2,510 | 2 |
| Lansdale, PA | Incorporated | 17,083 | 5,708 | 1 |
| Willow Grove, PA | Unincorporated / CDP | 14,992 | 4,095 | 1 |
| Montgomeryville, PA | Unincorporated / CDP | 13,082 | 2,751 | 3 |
| Ardmore, PA | Unincorporated / CDP | 12,808 | 6,498 | 2 |
| Harleysville, PA | Unincorporated / CDP | 9,568 | 2,290 | 2 |
| Audubon, PA | Unincorporated / CDP | 9,163 | 1,994 | 2 |
| Sanatoga, PA | Unincorporated / CDP | 8,588 | 2,543 | 1 |
| Kulpsville, PA | Unincorporated / CDP | 8,348 | 2,445 | 3 |
| Conshohocken, PA | Incorporated | 8,047 | 8,011 | 2 |
| Glenside, PA | Unincorporated / CDP | 7,819 | 6,105 | 1 |
| Hatboro, PA | Incorporated | 7,501 | 5,276 | 1 |
| Souderton, PA | Incorporated | 7,082 | 6,314 | 1 |
| Plymouth Meeting, PA | Unincorporated / CDP | 6,947 | 1,904 | 1 |
| Maple Glen, PA | Unincorporated / CDP | 6,726 | 2,155 | 2 |
| Ambler, PA | Incorporated | 6,491 | 7,615 | 1 |
| Blue Bell, PA | Unincorporated / CDP | 6,250 | 1,158 | 2 |
| Trooper, PA | Unincorporated / CDP | 5,965 | 2,505 | 1 |
| Penn Wynne, PA | Unincorporated / CDP | 5,932 | 5,579 | 1 |
| Fort Washington, PA | Unincorporated / CDP | 5,728 | 1,759 | 1 |
| Wyndmoor, PA | Unincorporated / CDP | 5,638 | 3,424 | 1 |
| Oreland, PA | Unincorporated / CDP | 5,625 | 3,859 | 2 |
| Gilbertsville, PA | Unincorporated / CDP | 5,438 | 1,621 | 1 |
| Eagleville, PA | Unincorporated / CDP | 5,302 | 3,282 | 2 |
| Collegeville, PA | Incorporated | 5,174 | 3,289 | 1 |
The county also contains 25 smaller communities that appear here but do not have separate pages because their populations are too small for reliable data: Telford, Royersford, Bridgeport, Jenkintown, Narberth, Flourtown, Spring House, Pennsburg, Trappe, Bryn Mawr, Pottsgrove, North Wales, East Greenville, Wyncote, Halfway House, Rockledge, Red Hill, Spring Mount, Evansburg, Woxall, West Conshohocken, Bryn Athyn, Schwenksville, Arcadia University, Green Lane. Residents of these places often depend on the county for services such as roads, courts and public health.
How large is Montgomery County compared with other counties in Pennsylvania?
Adding up the estimates for the places in our data gives 433,740 people, which ranks Montgomery County 8th among 67 counties in Pennsylvania. The average listed place has about 8,341 residents. The weighted density is about 4,624 people per square mile, which is suburban by our scale. These totals add up place estimates, so they can differ from the official county population, which includes people outside any listed place. See why population figures differ.
What ZIP codes are in Montgomery County?
The places in Montgomery County use 53 ZIP codes: 18041, 18054, 18073, 18076, 18936, 18964, 18969, 18979, 19002, 19003, 19006, 19009, 19010, 19031, 19034, 19038, 19040, 19041, 19044, 19046, 19072, 19075, 19090, 19095, 19096, 19401, 19403, 19404, 19405, 19406, 19407, 19408, 19409, 19415, 19422, 19424, 19426, 19428, 19429, 19438, 19441, 19443, 19446, 19454, 19455, 19462, 19464, 19468, 19473, 19477, 19478, 19484, 19525. Every code begins with 1, which is assigned to the Mid-Atlantic (Delaware, New York and Pennsylvania). A ZIP code can cross county lines, so a code listed here may also serve addresses in a neighboring county. Use the ZIP code lookup to check a single code, or read how ZIP codes work.
Which counties are near Montgomery County?
The closest counties by distance between the average locations of their places are listed below. The distance is a rough guide to how close the areas are, because county shapes vary widely.
- Bucks County, PA — about 16 miles east (center to center), 174,465 people in listed places
- Philadelphia County, PA — about 16 miles southeast (center to center), 5,649,300 people in listed places
- Delaware County, PA — about 20 miles south (center to center), 249,229 people in listed places
- Chester County, PA — about 24 miles southwest (center to center), 134,683 people in listed places
- Camden County, NJ — about 27 miles southeast (center to center), 325,286 people in listed places
- Gloucester County, NJ — about 31 miles south (center to center), 109,717 people in listed places
What does the FIPS code 42091 mean?
The first two digits, 42, identify Pennsylvania, and the last three, 091, identify Montgomery County inside that state. Government datasets use this code to join records without confusing counties that share a name. Our guide to counties and FIPS codes explains the numbering, and the Pennsylvania hub lists every county we cover in the state.
Where to go next
Combined place populations are estimates from a compiled dataset and are not official county totals.