Plum Grove, Texas, a City, in Liberty County spans over 7.3 square miles and has a population of 930 citizen. Plum Grove is at the junction of Farm roads 2090 and 1010, forty miles northeast of Houston in northwestern Liberty County. It was incorporated by a 55–7 vote in December 1968 and secured a voting precinct 5½ years later. Notifications Please see Bids section for new Public Notices Monthly meetings are held the second Monday of each month. Please see the Calendar for information on regular meetings and special meetings.