According to the United States Census Bureau, the township has a total area of 14.4 square miles (37.2 km²), of which, 14.3 square miles (37.1 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.14%) is water.
Middlecreek Township is bordered by Jackson Township to the north, Penn Township to the east, Washington Township to the south and Franklin and Center Townships to the west.
The census-designated place of Kreamer is in the southern part of the township.
As of the census of 2010, there were 2,114 people, 732 households, and 595 families residing in the township. The population density was 137.6 people per square mile (53.1/km²). There were 754 housing units at an average density of 52.6/sq mi (20.3/km²). The racial makeup of the township was 99.19% White, 0.10% African American, 0.10% Asian, 0.10% from other races, and 0.51% from two or more races. Hispanic or Latino of any race were 0.56% of the population.
There were 732 households out of which 37.6% had children under the age of 18 living with them, 70.9% were married couples living together, 6.6% had a female householder with no husband present, and 18.7% were non-families. 15.4% of all households were made up of individuals and 5.6% had someone living alone who was 65 years of age or older. The average household size was 2.69 and the average family size was 2.98.
In the township the population was spread out with 26.0% under the age of 18, 7.6% from 18 to 24, 32.3% from 25 to 44, 24.5% from 45 to 64, and 9.5% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 100.7 males. For every 100 females age 18 and over, there were 100.6 males.
The median income for a household in the township was $39,250, and the median income for a family was $42,460. Males had a median income of $30,262 versus $20,871 for females. The per capita income for the township was $16,005. About 4.8% of families and 5.9% of the population were below the poverty line, including 5.7% of those under age 18 and 4.9% of those age 65 or over.
Residents of Middlecreek Township may attend the local, public schools operated by Midd-West School District which provides full day kindergarten through 12th grade. In 2013, the Midd-West School District's enrollment declined to 2,200 students. In 2011, Midd-West School District enrollment was 2,202 pupils. The District's enrollment was 2,388 pupils in 2005-06. Midd-West School District operates: Midd-West High School (8th-12th), Midd-West Middle School (6th-7th), Middleburg Elementary School (K-5th), and West Snyder Elementary School (K-5th). In 2013, Midd-West School District’s graduation rate was 86%. In 2011, under the leadership of Dr. Wesley Knapp, Superintendent, Midd-West High School has placed on the state's Lowest Achieving Schools List. In 2013, the Pittsburgh Business Times ranked Midd-West School District 313th out of 496 public schools for academic achievement of its pupils. In 2012, Midd-West School District achieved Adequate Yearly Progress (AYP) despite the low academic achievement at the high school. In 2011, under the leadership of Dr. Wesley Knapp, Superintendent, Midd-West High School was placed on the state's Lowest Achieving Schools List.
SUN Area Technical Institute is a regional school that provides area students with skills needed to compete in today’s job market and receive consideration for advanced college placement. SUN Tech also offers adult education classes, technical career training, training in the building trades, auto mechanics, culinary arts, allied health careers and other areas. The School is ISO9001 and Middle States Accredited. SUN Tech was presented with the Significant Achievement Award in Education for raising their Malcolm Baldrige National Quality Award score to 648 points, a 345-point increase from 303 points in August, 2000. SUN Area Technical Institute is funded by a consortium of the school districts, which includes: Midd-West School District, Lewisburg Area School District, Shikellamy School District, Mifflinburg Area School District and Selinsgrove Area School District.
MIddlecreek Township resident children may also apply to attend any of the Commonwealth's 14 public, cyber charter schools (in 2013) at no additional cost to the parents. This includes SusQ Cyber Charter School which is locally operated. The resident’s public school district is required to pay the charter school and cyber charter school tuition for residents who attend these public schools. The tuition rate that Midd-West School District must pay was $9,626.31 in 2012. By Commonwealth law, if the District provides transportation for its own students, then the District must provide transportation to any school that lies within 10 miles of its borders. Residents may also seek admission for their school aged child to any other public school district. When accepted for admission, the student's parents are responsible for paying an annual tuition fee set by the Pennsylvania Department of Education. These public cyber charter schools include: 21st Century Cyber Charter School, The Pennsylvania Distance & Electronic Learning Academy, and The Pennsylvania Cyber Charter School.
Central Susquehanna Intermediate Unit #16 provides a wide variety of services to children living in its region which includes Middlecreek Township. Early screening, special education services, speech and hearing therapy, autistic support, preschool classes and many other services like driver education are available. Services for children during the preschool years are provided without cost to their families when the child is determined to meet eligibility requirements. Intermediate units receive taxpayer funding: through subsidies paid by member school districts; through direct charges to users for some services; through the successful application for state and federal competitive grants and through private grants. The CSIU15 also runs a health insurance consortium for regional public school employees.
Residents also have a selection of multiple education programs for children and adults.
Sunbury Christian Academy 135 Spruce Hollow Road, Northumberland, PA 17857. An ASCI member school preK to 12th grade. Accomplishments of students are frequently featured by local media outlets.
Northumberland Christian School 351 Fifth Street, Northumberland, PA 17857. NCS was founded in 1972 and is a ministry of the First Regular Baptist Church of Northumberland, Pa. The school offers a full educational program for students from preschool through high school.
Triangle Tech Sunbury School located in Upper Augusta Township on Rt. 890 just off of Route 61 in Northumberland County.
Empire Beauty School Orchard Hills Plaza US RTE 11 & 15, Shamokin Dam, Pennsylvania
Susquehanna University a private higher education institution located in Selinsgrove, Pennsylvania
Bucknell University a private university located in Lewisburg, Union County, Pennsylvania
Ongoing pollution and soil erosion in the region continue to degrade the water quality and the environment locally as well as regionally. Farming, wastewater treatment facilities and industrial spills are cited as contributing factors to loss of water quality. It also contributes to the pollution of the Chesapeake Bay. Controlling the wastewater discharges alone is expected to cost local taxpayers billions of dollars.
The Lower Penns Creek Watershed Association’s central purpose is to protect, conserve, and improve the Lower Penns Creek watershed by promoting the wise stewardship of the land and aquatic resources. The organization is open to all citizens. The organization has sponsored a main stream assessment. The Lower Penns Creek watershed is approximately 163 square miles (420 km2) within Mifflin, Snyder and Union Counties. It drains into the Susquehanna River on the northern border of the community of Selinsgrove, Pennsylvania. It is located within the Lower Susquehanna subbasin. LPCWA’s efforts contribute to the success of the missions of the Susquehanna Greenway Partnership and the Susquehanna River Basin Commission. The Snyder County Conservation District and the Union County Conservation District both have watershed specialists that participate in LPCWA.