New Berlin is a borough in Union County, Pennsylvania, United States.

[4] The New Berlin Presbyterian Church and Old Union County Courthouse are listed on the National Register of Historic Places.

[6] According to the United States Census Bureau, the borough has a total area of 0.4 square miles (1.0 km2), all land.

The Borough of New Berlin is located in central Pennsylvania, on the southern edge of Union County.

New Berlin became the second seat of county government when the first courthouse built specifically for that purpose was completed in 1815.

Ancestries: German (41.2%), United States (11.1%), English (6.1%), Irish (5.6%), Italian (4.1%), French (3.0%).