Neunkirchen is situated in the Steinfeld region of the Vienna Basin, part of Industrieviertel in the southeastern area of Lower Austria.

The municipality consists of three localities, which are also cadastral communities of the same names (area as of 1 January 2001,[3] population as of 1 January 2022[4]): NE: Sankt Egyden am Steinfeld; E: Breitenau; SE: Natschbach-Loipersbach; S: Wartmannstetten; W: Ternitz; NW: Würflach Neunkirchen is one of the oldest settlements in the Vienna Basin.

There was a Roman settlement from about 30 to 400 AD near the inner city, but its name is unknown.

Neunkirchen lies on the Südbahn (German: Southern Railway), Cityjet Xpress (CJX9) trains connecting it to Wiener Neustadt, Payerbach-Reichenau, and Vienna in 30 minute intervals.

This Lower Austria location article is a stub.