Borchen is a municipality in the district of Paderborn, in North Rhine-Westphalia, Germany.

At the north-western border of Borchen the Altenau flows into the Alme River.

Starting in the north, rotating clockwise, Paderborn, Lichtenau, Bad Wünnenberg and Salzkotten are neighbouring municipalities of Borchen.

In this period Prussia instituted new administrative divisions which, in a modified form, can still be found today.

Thus the area became a member of the newly founded administrative district of Minden in the Province of Westphalia.