The Census Bureau reports that there aren't many places in the country adding new housing faster than Isanti County. The county -- just north of the Twin Cities metro area -- is the nation's 13th fastest-growing county. From July 2001 to July 2002, the number of housing units rose six-point-one per cent. More than 700 new units were built, primarily around Cambridge and Isanti. Curt Becker is the Isanti County assessor. He says the county's national ranking came as a surprise.