Capital-area home sales racked up a third straight month of year-over-year gains in June, as closed escrows reached almost a two-year high, DataQuick Information Systems reported today. But median prices continue to fall. The sales increases were not universal, though. Half of area counties - Sacramento, Sutter, Yolo and Yuba - saw higher sales than the same time last year. Four others - Placer, El Dorado, Amador and Nevada - still showed fewer sales than a year ago. The La Jolla property research firm reported that 3,922 homes closed escrow during June in Amador, El Dorado, Placer, Sacramento, Sutter, Yolo and Yuba counties. That was the highest number since September 2006. The month also marked a 15-month low in the number of homes for sale in El Dorado, Placer, Sacramento and Yolo counties, according to another researcher, Trend Graphix of Sacramento. June ended with 11,854 homes for sale in those counties - 4,073 fewer than last year as buyers scoop up thousands of discounted foreclosed homes being sold by banks.