Also in 1866, the Otter Lake post office opened and the village that formed around the post office also came to have the same name. Since then, Philemon Wright, pioneer of the logging industry in Ottawa, operated a wood depot at Otter Lake. The industry has played and continues to play a leading role in the early and contemporary history of the village.
In 1877, the United Township Municipality of Leslie-Clapham-et-Huddersfield was formed from its constituent townships. While Clapham Township was not officially established until 1920, it was already planned in the second half of the 19th century and named after a village north of Bedford, England. The united municipality was established because it was more advantageous to hold a municipal status than remain unorganized territory.
In 2004 the United Township Municipality of Leslie-Clapham-et-Huddersfield became the Municipality of Otter Lake.