Political Data Inc. on Tuesday released its latest count showing that voters registered with no party preference now outnumber Republicans by about 73,000 in California. The company regularly collects raw voter files from county registrars to maintain an updated database of the state’s 19 million voters.

At the close of regular registration, 15 days before the June primary, there were 4,844,803 no-party-preference voters, according to Political Data Inc., compared with 4,771,984 Republicans. Both make up about a quarter of the California electorate, trailing 8,436,493 registered Democrats, about 44.4 percent.

It is the culmination of a trend that has been accelerating for years. California voters have shed their party affiliation at a growing rate, even as state politics are increasingly dominated by Democrats.