The median sales price last month in Anne Arundel County was up 8.7 percent from October 2011, to $299,000. In Baltimore City, the average sales price rose 16.6 percent, to $96,800. Baltimore County's figure was up 3.6 percent, to $202,050. Carroll County saw an increase of 5.8 percent, to $256,055. Harford County experienced a 2.2 percent rise, to $229,950, and Howard County saw a 5.8 percent increase, to $350,000.