[gallery ids="334933"] The average home sales price and average number of days on the market increased in most Tomball and Magnolia ZIP codes from June 2016-May 2017 to June 2017-May 2018. Additionally, the number of homes sold fluctuated year-over-year in each ZIP code, according to data from Carswell Real Estate Co. Inc. However, home sales nearly doubled during that time, selling almost twice as quickly in ZIP code 77362.