You're Under Arrest didn't end with the four-episode OVA.
First, there's a 52-episode TV series. It's available dubbed in English--and this is one of the best dubbing jobs in history. (In fact, the director made his Japanese cast watch the English version to get a better read on the characters.) There's also the feature film, which fits in well with the series. And then there are the mini-specials, a series of 20 eight-minute shorts, which tend to focus on brief episodes in the characters' lives outside of their police work. The mini-specials also tend to be a bit racier than the OVA's and TV show. Finally, there's plenty of English-language bonus material on the DVD releases.
There's also at least one special not available in English (but there are fansubs), called "You're Under Arrest in America: No Mercy."
Finally, if you can't get enough of Miyuki and Natsumi, there's the live-action series (not available in English, but again there are fansubs). This show is quite different from the anime, and will probably seem truly bizarre to anyone who's not Japanese, but you can't talk about YUA without mentioning the live series.
