Among cities in Washington County, only Hillsboro, Forest Grove and North Plains posted population gains in 2012-13, according to new estimates released by the Population Research Center at Portland State University.

Forest Grove was listed as one of the fastest-growing municipalities in Oregon, adding 880 residents between July 2012 and July 2013, according to the report, which was released earlier this week. That’s more than all but five other cities statewide (Portland, Salem, Eugene, Wilsonville and Oregon City).

The bump brings the city’s estimated population to 22,340 and includes about 260 residents whose homes were annexed during that time period, city officials say.

Hillsboro’s population jumped by 790 (from 92,550 to 93,340) and North Plains, which edged up from 1,190 and 2,015. Cornelius’ estimated population held steady at 11,915.

Banks stayed at 1,775 and Gaston remained at 640.

The estimates are based on a variety of factors, including birth and death certificates, construction permits and school enrollments.

And there’s more than bragging rights at stake. Once the estimates are certified in December, they will be used to disperse state tax funds.

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