Rathenow is a town in the district of Havelland in Brandenburg, in eastern Germany, with a population of 24,063. The Protestant church of St. …Rathenow is a town in the district of Havelland in Brandenburg, in eastern Germany, with a population of 24,063. The Protestant church of St. Marien Andreas, originally a basilica, and transformed to the Gothic style in 1517-1589, and the Roman Catholic Church of St. George, are noteworthy.