Mifflin County
County
former Mifflin County Courthouse
Seal
Location within the U.S. state of Pennsylvania
Pennsylvania's location within the U.S.
Coordinates: 40°37′N 77°37′W / 40.61°N 77.62°W / 40.61; -77.62
Country	United States
State	Pennsylvania
Founded	September 19, 1789
Named for	Thomas Mifflin
Seat	Lewistown
Largest borough	Lewistown
Area
• Total	415 sq mi (1,070 km2)
• Land	411 sq mi (1,060 km2)
• Water	3.7 sq mi (10 km2)  0.9%
Population  (2020)
• Total	46,143
• Density	110/sq mi (43/km2)
Time zone	UTC−5 (Eastern)
• Summer (DST)	UTC−4 (EDT)
Congressional district	13th
Website	www.co.mifflin.pa.us

Mifflin County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 46,143.^[1] Its county seat is Lewistown.^[2][1] The county was created on September 19, 1789, from parts of Cumberland County and Northumberland County. It was named for Thomas Mifflin, the first Governor of Pennsylvania. Mifflin County comprises the Lewistown, PA Micropolitan Statistical Area. The county is part of the Central Pennsylvania region of the state.^[a]

The county terrain is formed by the folded Appalachian Mountain ridges which run from southwest to northeast across the county. The terrain slopes to the northeast,^[3] with its highest point (Broad Mtn) 1.25 miles (2.01 km) East Northeast from the county's Northwest corner, just south of the county's border with Centre County. It measures 2,339 ft (713 m) Above sea level.^[4] The Juniata River flows northeast through the lower part of the county, exiting northeastward into Juniata County near Hawstone.^[5] The county has a total area of 415 square miles (1,070 km²), of which 411 square miles (1,060 km²) is land and 3.7 square miles (9.6 km²) (0.9%) is water.^[6]

Mifflin County is located in, and has its boundaries defined by, the Ridge-and Valley Appalachian Mountains of Pennsylvania. The county is one of the 423 counties served by the Appalachian Regional Commission,^[7] and it is identified as part of the "Midlands" by Colin Woodard in his book American Nations: A History of the Eleven Rival Regional Cultures of North America.^[8]

US Route 322, a major divided highway, connects the county to the rest of the state on its route between Harrisburg and State College. US Route 522 also connects the county to the rest of the state on its route between Selinsgrove and Mount Union.

The county has a humid continental climate (Dfa/Dfb) and average temperatures in downtown Lewistown range from 27.8 °F in January to 72.7 °F in July.^[9]

As of the 2010 U.S. census, there were 46,682 people and 18,743 households in the county. The population density was 113.6 people per square mile (43.9 people/km²). There were 21,537 housing units at an average density of 52.4 units per square mile (20.2/km²). The racial makeup of the county was 97.53% White, 0.64% Black or African American, 0.11% Native American, 0.36% Asian, 0.01% Pacific Islander, 0.31% from other races, and 1.03% from two or more races. 1.14% of the population were Hispanic or Latino of any race. 38.8% were of German, 19.2% American, 8.0% Irish and 7.5% English ancestry. 5.7% report speaking Pennsylvania Dutch, Dutch, or German at home.^[16]

There were 18,743 households, out of which 29.1% had children under the age of 18 living with them, 57.60% were married couples living together, 8.50% had a female householder with no husband present, and 29.90% were non-families. 26.00% of all households were made up of individuals, and 13.20% had someone living alone who was 65 years of age or older. The average household size was 2.49 and the average family size was 2.99.

The county population contained 23.1% under the age of 18, 2.2% from 18 to 19, 5.1% from 20 to 24, 10.4% from 25 to 34, 20.1% from 35 to 49, 20.6% from 50 to 64, and 18.5% who were 65 years of age or older. The median age was 39 years. The population was 48.93% male, and 51.07% female.

The Amish community in Mifflin County, established in 1791, had a total population of 3,905 people (in 30 congregations) in 2017,^[18] or 8.5% of the county's population.

The dominant form of speech in Mifflin County is the Central Pennsylvania accent. Almost everyone in Mifflin County speaks English. The Amish and some Mennonites speak Pennsylvania German, also known as Pennsylvania Dutch, a West Central German dialect, which is quite different from modern Standard German. The Amish and Mennonites also can speak English. Few non-Amish or Mennonites in Mifflin County today speak Pennsylvania German, but this was not true in the past.

The United States Office of Management and Budget^[19] has designated Mifflin County as the Lewistown, PA Micropolitan Statistical Area (μSA).^[20] As of the 2010 United States Census^[21] the micropolitan area ranked 10th most populous in the State of Pennsylvania and the 237th most populous in the United States with a population of 46,682.

• Rob Postal (R)
• Noah Wise (R)
• Kevin Kodish (D)

• Helen Kirk (R)
• Barbara Clemmons (R)
• Kendra Dunmire (D)

• District Attorney: Christopher Torquato (R)
• Sheriff: James Drayer (R)
• Treasurer: Diane Griffith (R)
• Register & Recorder: Ellen Amspacker (R)
• Coroner: Andrea Alcalde (R)
• Prothonotary: Tammy Stuck (R)

• David H. Rowe, Republican, Pennsylvania's 85th Representative District
• Kerry A. Benninghoff, Republican, Pennsylvania's 171st Representative District

(as of January 2023)

• Judy Ward, Republican, Pennsylvania's 30th Senatorial District

(as of January 2023)

• John Joyce, Republican, Pennsylvania's 13th congressional district

• John Fetterman, Democrat
• Bob Casey, Jr., Democrat

Mifflin County voters have been reliably Republican. In only one national election since 1940 has the county selected the Democratic Party candidate.

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