In 1852, he married Margaret Shannon. He was a justice of the peace and also served as reeve for Peel Township. McKim resigned his seat in the provincial legislature in 1874 to compete unsuccessfully in Wellington Centre for a seat in the federal parliament.
McKim's life involved marrying Margaret Shannon in 1852, holding various community roles such as justice of the peace and reeve for Peel Township. He gave up his spot in the provincial legislature in 1874 to try to secure a federal parliamentary seat in Wellington Centre.