Warren County Courthouse
Location within the U.S. state of Pennsylvania
Pennsylvania's location within the U.S.
|Founded||October 1, 1819|
|Named for||Joseph Warren|
|o Total||899 sq mi (2,330 km2)|
|o Land||884 sq mi (2,290 km2)|
|o Water||14.1 sq mi (37 km2) 1.6%%|
| o Estimate |
|o Density||46/sq mi (18/km2)|
|Time zone||UTC-5 (Eastern)|
|o Summer (DST)||UTC-4 (EDT)|
Warren County is a county located in the U.S. state of Pennsylvania. As of the 2010 census, the population was 41,815. Its county seat is Warren. The county was formed in 1800 from parts of Allegheny and Lycoming counties; attached to Crawford County until 1805 and then to Venango County until Warren was formally organized in 1819.
Warren County makes up the Warren, PA Micropolitan Statistical Area.
According to the U.S. Census Bureau, the county has a total area of 899 square miles (2,330 km2), of which 884 square miles (2,290 km2) is land and 14 square miles (36 km2) (1.6%) is water. Notable physical features include the Allegheny River, the Allegheny Reservoir, the Kinzua Dam, and the Allegheny National Forest. The county has a warm-summer humid continental climate (Dfb) and average temperatures in the city of Warren range from 24.5° F in January to 69.3° F in July. 
As of the census of 2000, there were 43,863 people, 17,696 households, and 12,121 families residing in the county. The population density was 50 people per square mile (19/km²). There were 23,058 housing units at an average density of 26 per square mile (10/km²). The racial makeup of the county was 98.68% White, 0.21% Black or African American, 0.19% Native American, 0.27% Asian, 0.02% Pacific Islander, 0.12% from other races, and 0.52% from two or more races. 0.34% of the population were Hispanic or Latino of any race. 22.2% were of German, 12.4% Swedish, 11.2% American, 10.5% Irish, 8.8% English, 8.2% Italian, and 5.1% Polish ancestry.
There were 17,696 households out of which 29.80% had children under the age of 18 living with them, 56.10% were married couples living together, 8.40% had a female householder with no husband present, and 31.50% were non-families. 27.20% of all households were made up of individuals and 12.20% had someone living alone who was 65 years of age or older. The average household size was 2.42 and the average family size was 2.93.
In the county, the population was spread out with 24.10% under the age of 18, 6.40% from 18 to 24, 27.00% from 25 to 44, 25.90% from 45 to 64, and 16.70% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 96.20 males. For every 100 females age 18 and over, there were 92.80 males.
According to research by The Center for Rural Pennsylvania, which is a legislative agency of the Pennsylvania General Assembly, the poverty rate for Warren County was 14.1% in 2014. The statewide poverty rate was 13.6% in 2014. The 2012 childhood poverty rate by school district was: Warren County School District - 46.1% living at 185% or below than the Federal Poverty Level and Titusville Area School District - 57.9%. The child poverty rate is collected by the school districts as part of them operating the federal, free school lunch program.
Warren County's live birth rate was 566 births in 1990. The County's live birth rate in 2000 declined to 494 births, while in 2011 it had declined further to 392 babies. From 1960 to 2010, rural Pennsylvania has experienced an ongoing decline in the number of residents under 18 years old.
Warren County had a 257 babies born to teens (age15-19) in 2011. In 2015, the number of teen births in Warren County was 247.
The United States Office of Management and Budget has designated Warren County as the Warren, PA Micropolitan Statistical Area (µSA). As of the 2010 U.S. Census the micropolitan area ranked 14th most populous in the State of Pennsylvania and the 298th most populous in the United States with a population of 41,815.
per Education Names and Addresses directory which is annually developed by the Pennsylvania Department of Education, 2016
There is one Pennsylvania state park in Warren County. Chapman State Park is adjacent to Allegheny National Forest and State Game Land 29 just of U.S. Route 6, near Clarendon. Warren County also contains a tract of old-growth forest called Hearts Content National Scenic Area.
Under Pennsylvania law, there are four types of incorporated municipalities: cities, boroughs, townships, and, in at most two cases, towns. The following cities, boroughs and townships are located in Warren County:
Some communities are neither incorporated nor treated as census-designated places.
+ county seat
|Rank||City/Town/etc.||Municipal type||Population (2010 Census)