Three of the four Orange County-based automakers outpaced the industry overall in June, according to Autodata Corp.

U.S. vehicle sales rose 1.2% for the month, to about 1.4 million. Sales are on pace to reach 16.9 million for the year, the highest level since 2006, according to the New Jersey-based market researcher.

Automakers sold 8.14 million vehicles nationwide in the first half of this year, a 4.3% increase.

Fountain Valley-based Hyundai Motor America Inc., the largest automaker with operations based in OC, sold 67,407 vehicles in June, up 3.7% over the same year-ago period. Its sales totals in the first half of the 2014 were 364,434 vehicles, a 0.9% increase from the same period last year.

Mazda North American Operations, also based in Irvine, posted a 16.6% increase in vehicle sales, for a total of 26,208.

“June was a strong month for Mazda, the best we have seen since 2004,” Ron Stettner, Mazda’s vice president of sales, said in a statement. “We received strong sales performance from our top three carlines of Mazda3, Mazda6 and CX-5. This is the first time in history that Mazda has had three model lines with great sales performance.”

Mazda’s half-year sales added up to 156,430 vehicles, a 7.9% uptick from the year-ago period.

Mitsubishi Motors North America Inc. sold 6,021 vehicles, up 13.7% from a year earlier. The Cypress-based automaker sold 39,672 in the first half of 2014, a 30.2% increase from the same period last year.

Irvine-based Kia Motors America Inc. sold 50,644 vehicles in June, up 0.2% from a year earlier. The automaker’s six-month sales total was 297,413—its best-ever first-half year performance—good for a 7.2% increase from the first half of 2013.