County outline
Where Lycoming County is located
Area breakdown
Land accounts for 98.8% of Lycoming County’s measured area and water for 1.2%. Its combined area converts to 3,221.8 square kilometers or approximately 796,125 acres.
Green: land · blue: water
| Measurement | Square miles | Square kilometers | Acres |
|---|---|---|---|
| Land | 1,228.92 | 3,182.888 | 786,508.8 |
| Water | 15.026 | 38.917 | 9,616.6 |
| Total | 1,243.946 | 3,221.805 | 796,125.4 |
How Lycoming County compares
By original Census land area, Lycoming County ranks #1 of 67 in Pennsylvania and #499 of 3,222 nationally. National rankings include the 50 states, District of Columbia, and Puerto Rico.
Its land area is 1.881 times the Pennsylvania county-equivalent median of 653.3 square miles. It accounts for 2.7% of the combined county land area in the state.
See the complete Pennsylvania ranking · What counts as a county equivalent?
Population and density of Lycoming County
The Census Bureau estimates that 112,587 people lived in Lycoming County on July 1, 2025. That ranks #577 of 3,222 county equivalents nationally and #29 of 67 in Pennsylvania. Since the April 1, 2020 estimates base of 114,199, the population has declined by 1,612 (−1.4%), compared with +0.4% for Pennsylvania as a whole.
With 1,228.9 square miles of land, that is 92 people per square mile (35 per km²), placing Lycoming County #1,059 nationally for density and #42 in Pennsylvania. The median county equivalent has 47 people per square mile; the Pennsylvania median is 137. Put another way, there are about 7 acres of land per resident.
| July 1 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|---|
| Estimate | 114,120 | 113,579 | 113,195 | 113,192 | 112,918 | 112,587 |
| Change | — | −541 | −384 | −3 | −274 | −331 |
U.S. Census Bureau, Vintage 2025 population estimates. Estimates are revised each year and are not decennial census counts. Density divides the whole population by the whole county’s land area, so it describes an average, not how settlement is distributed within the county. Population sources and methods.
Cities and towns in Lycoming County
Lycoming County is divided into 52 municipalities and townships. In Pennsylvania, county subdivisions are local governments, and together they cover all of the county’s land and residents.
The most populous is Williamsport city, with 27,384 residents (24.3% of the county). The largest by land is McHenry township, at 76.2 mi², or 6.2% of the county’s land. Among those with at least 1,000 residents in 2020, Muncy township grew fastest since then (+0.8%).
| County subdivision | Population 2025 | Since 2020 | Land mi² | Share of county land |
|---|---|---|---|---|
| Williamsport cityCounty seat | 27,384 | −1.3% | 8.777 | 0.7% |
| Loyalsock township | 11,393 | −1.7% | 21.1 | 1.7% |
| South Williamsport borough | 6,124 | −2.1% | 1.899 | 0.2% |
| Old Lycoming township | 4,924 | −1% | 9.385 | 0.8% |
| Montoursville borough | 4,635 | −2.4% | 3.633 | 0.3% |
| Jersey Shore borough | 4,048 | −2.2% | 1.158 | 0.1% |
| Clinton township | 3,608 | −2.8% | 27.4 | 2.2% |
| Muncy Creek township | 3,563 | −0.4% | 20 | 1.6% |
| Wolf township | 3,084 | −0.7% | 19.6 | 1.6% |
| Fairfield township | 2,806 | −0.7% | 12.1 | 1% |
| Hepburn township | 2,534 | −1.1% | 16.7 | 1.4% |
| Muncy borough | 2,383 | −2.4% | 0.85 | 0.1% |
| Hughesville borough | 2,089 | −2.5% | 0.645 | 0.1% |
| Woodward township | 2,018 | −1.3% | 13 | 1.1% |
| Eldred township | 1,968 | −1.5% | 14.2 | 1.2% |
Show the other 37 subdivisions
| Name | Population 2025 | Since 2020 | Land mi² |
|---|---|---|---|
| Limestone township | 1,952 | −0.8% | 33.6 |
| Upper Fairfield township | 1,798 | −0.8% | 18 |
| Washington township | 1,760 | −0.4% | 48.2 |
| Porter township | 1,539 | −1% | 7.606 |
| Montgomery borough | 1,538 | −2.4% | 0.547 |
| Lycoming township | 1,486 | −1% | 15.2 |
| Muncy township | 1,185 | +0.8% | 15.5 |
| Duboistown borough | 1,184 | −1.1% | 0.552 |
| Mifflin township | 1,077 | −1.2% | 27.7 |
| Piatt township | 1,032 | −1.7% | 9.772 |
| Moreland township | 1,031 | +0.6% | 23.9 |
| Susquehanna township | 949 | −2.2% | 6.567 |
| Cogan House township | 928 | −0.4% | 69.9 |
| Penn township | 896 | +0.3% | 26.3 |
| Franklin township | 886 | −2.2% | 23.9 |
| Lewis township | 854 | −1% | 37.1 |
| Anthony township | 849 | −2% | 15.6 |
| Jordan township | 833 | −1.5% | 20.9 |
| Gamble township | 785 | +0.9% | 45 |
| Armstrong township | 676 | −2.3% | 24.7 |
| Nippenose township | 653 | −1.4% | 11 |
| Picture Rocks borough | 635 | −2.3% | 0.974 |
| Mill Creek township | 591 | +1.5% | 11.4 |
| Plunketts Creek township | 586 | −1.5% | 53.5 |
| Watson township | 527 | −1.3% | 23.1 |
| Bastress township | 516 | −1.9% | 9.416 |
| Brady township | 491 | −2% | 8.842 |
| McIntyre township | 454 | −1.5% | 46.6 |
| Cascade township | 419 | −0.2% | 39.2 |
| Shrewsbury township | 412 | −1.9% | 18.7 |
| Jackson township | 392 | −0.5% | 37 |
| Cummings township | 260 | −1.5% | 69.4 |
| Pine township | 256 | −1.5% | 74.7 |
| Salladasburg borough | 243 | −2% | 0.777 |
| McNett township | 142 | −2.1% | 33.5 |
| McHenry township | 120 | −0.8% | 76.2 |
| Brown township | 91 | −1.1% | 73.3 |
Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each subdivision inside Lycoming County. Land: 2026 Census Gazetteer. How communities are listed.
Metropolitan area
Lycoming County is a central county of the Williamsport, PA Metropolitan Statistical Area. Lycoming County is the area’s only county equivalent, so the metro area has the same 1,228.9 square miles of land. By combined land it ranks #256 of 393 metropolitan areas, and #348 by population. It belongs to the Williamsport-Lock Haven, PA Combined Statistical Area.
ZIP codes
30 ZIP Code Tabulation Areas have land in Lycoming County; 20 of them have most of their land inside the county, and the others mainly cover neighboring areas.
169301693817701177021772017723177241772717728177371773917740177421774417745177521775417756177581776217763177651776917771177741777617810178141784618619
ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Lighter codes have less than half of their land in this county. Post-office-box and single-address ZIP Codes have no tabulation area.
Counties bordering Lycoming County
Lycoming County shares a land border with 9 county equivalents. It has more land than every one of them. The largest neighbor is Bradford County (1,147.4 mi²) and the smallest is Montour County (130.3 mi²). Together with its neighbors, Lycoming County forms a block of 7,318.4 mi² of land, of which it holds 16.8%.
| Bordering county equivalent | Land mi² | Size vs. Lycoming | Compare |
|---|---|---|---|
| Bradford County | 1,147.4 | 1.1× smaller | Compare |
| Tioga County | 1,133.9 | 1.1× smaller | Compare |
| Potter County | 1,081.2 | 1.1× smaller | Compare |
| Clinton County | 889.8 | 1.4× smaller | Compare |
| Columbia County | 483.3 | 2.5× smaller | Compare |
| Northumberland County | 457.7 | 2.7× smaller | Compare |
| Sullivan County | 449.9 | 2.7× smaller | Compare |
| Union County | 316 | 3.9× smaller | Compare |
| Montour County | 130.3 | 9.4× smaller | Compare |
How big is Lycoming County compared with U.S. states?
Lycoming County has more land than 1 of the 50 states. It is about 1.2 times the land area of Rhode Island (1,033.9 mi²), while Delaware, the next larger state, has 1.6 times as much land (1,948.6 mi²). Pennsylvania’s county land could hold about 36 areas the size of Lycoming County.
Another way to picture it: the same land area would fill a square about 35.1 miles (56.4 km) on each side. Real county shapes are rarely square, so this is a scale reference rather than a width or driving distance.
State figures are the sums of each state’s county-equivalent land measurements in the same Census release, so states and counties are compared on the same basis. Published state totals can differ slightly because of rounding. Compare all states · Counties bigger than entire states.
What stands out about Lycoming County?
Lycoming County has more land than 2,723 of the other 3,221 county equivalents in the dataset.
A median is the middle county-equivalent measurement, not the average of the largest and smallest. All three bars use the same linear scale. Very small areas may appear as a thin sliver; the labels retain their values.
Does including water change its rank?
Using land plus water places Lycoming County at #564 nationally by total area, 65 places farther from the top than its land rank. Other county equivalents gain more area when their water measurements are included.
Its water share is 1.2%, compared with a national county-equivalent median of 1.2%. The two percentages are within 0.1 percentage points of each other. This describes the statistical geography’s land/water mix, not flood exposure or developable land.
Closest positions in the national land ranking
These entries sit immediately beside Lycoming County in the national ranking. They can be in different states and are not necessarily geographic neighbors.
| Land rank | County equivalent | Land mi² | Comparison |
|---|---|---|---|
| #498 | Mobile County, Alabama | 1,229.4 | Compare |
| #499 | Lycoming County, Pennsylvania | 1,228.9 | This county |
| #500 | Costilla County, Colorado | 1,227.6 | Compare |
Calculated from the same Census release as the area table. Total-area order uses original ALAND + AWATER; water shares and chart labels use published square miles. Calculation details.
Representative coordinates
The Census internal point is 41.343882, -77.055262. It represents a location inside the geography; it is not necessarily the centroid or the address of a courthouse.
Source and precision
U.S. Census Bureau, 2026 Gazetteer Files, Counties. Original ALAND: 3,182,887,143 m²; AWATER: 38,917,209 m². Rankings use ALAND; exact ties use ascending GEOID. Tables preserve Census-published square miles to three decimals, with conversions based on those values.
Common questions
How big is Lycoming County?
Lycoming County, Pennsylvania has 1,228.9 square miles (3,182.9 km²) of land and 15 square miles of water, for a total area of 1,243.9 square miles. It ranks #499 of 3,222 U.S. county equivalents by land area.
Is Lycoming County the largest county in Pennsylvania?
Yes. Lycoming County has the most land of the 67 county equivalents in Pennsylvania.
What counties border Lycoming County?
Lycoming County shares a land border with Tioga County, Clinton County, Sullivan County, Union County, Columbia County, Northumberland County, Montour County, Potter County, and Bradford County.
What is the population of Lycoming County?
The Census Bureau estimates Lycoming County had 112,587 residents on July 1, 2025, ranking #577 of 3,222 county equivalents. That is 92 people per square mile of land.
What is the county seat of Lycoming County?
The county seat of Lycoming County is Williamsport.
What cities and towns are in Lycoming County?
Lycoming County has 52 county subdivisions (cities, towns and townships). The most populous five are Williamsport city, Loyalsock township, South Williamsport borough, Old Lycoming township, and Montoursville borough.
Is Lycoming County part of a metropolitan area?
Yes. It is a central county of the Williamsport, PA Metropolitan Statistical Area.
How many ZIP codes are in Lycoming County?
30 ZIP Code Tabulation Areas have land in Lycoming County, and 20 of them have most of their land inside the county. Census ZIP Code Tabulation Areas approximate USPS ZIP Code areas.
How does Lycoming County compare with U.S. states?
It has more land than 1 of the 50 states, including Rhode Island (1,033.9 square miles of land).
How many acres of land are in Lycoming County?
The land measurement converts to approximately 786,509 acres. Including water, total area is approximately 796,125 acres. One square mile equals 640 acres.
Why might another source show a different area?
Check whether it reports land or total area, its Census vintage, and its rounding. Our guide explains how to reconcile county area figures.
Can this establish a property boundary?
No. Statistical measurements and generalized maps do not establish property lines. Consult the relevant local surveying or land-records authority.