Mifflinburg is a very small borough located in the state of Pennsylvania. With a population of 3,470 people and two associated neighborhoods, Mifflinburg is the 434th largest community in Pennsylvania.

Being a small borough, Mifflinburg does not have a public transit system used by locals to get to and from work.

The overall education level of Mifflinburg citizens is substantially higher than the typical US community, as 31.52% of adults in Mifflinburg have at least a bachelor's degree, and the average American community has 21.84%.

The per capita income in Mifflinburg in 2022 was $31,857, which is lower middle income relative to Pennsylvania and the nation. This equates to an annual income of $127,428 for a family of four. However, Mifflinburg contains both very wealthy and poor people as well.

The people who call Mifflinburg home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Mifflinburg residents report their race to be White, followed by Asian. Important ancestries of people in Mifflinburg include German, Italian, English, Polish, and Irish.

The most common language spoken in Mifflinburg is English. Other important languages spoken here include Italian and Polish.