Domestic brands increased their certified pre-owned sales nearly 23 percent in June, pushing year-to-date sales closer to half-a-million, according to Autodata Corp.

More specifically, the Big 3 combined to move 78,995 CPO units during the month, which beat June 2014 figures by 22.9 percent. Through the first half of the year, domestics have moved 473,444 certified vehicles for a 19-percent increase, Autodata said. 

The brands at Ford combined to sell 26,120 CPO units in June (up 14.5 percent year-over-year), with year-to-date sales at 145,648 (up 10.4 percent).

Breaking that figure down, Ford/Mercury CPO sales in June came in at 24,019 units (up 15.9 percent) and Lincoln CPO sales were at 2,101 units (up 0.2 percent).

Over at General Motors, CPO sales for the Buick, Chevrolet, GMC, Pontiac and Saturn brands reached 34,777 units in June (up 20.2 percent). Six-month sales were at 224,292 units (up 20.7 percent), according to Autodata. 

The Cadillac brand had 2,007 certified sales (up 25.7 percent), with year-to-date sales reaching 12,767 (up 26.2 percent).

Next up, certified sales for the Chrysler, Dodge, Jeep and Ram brands jumped 47.2 percent in June, coming in 16,091. In the first half of the year, these dealers moved 90,737 CPO units (up 29.6 percent).