How about one that has numerous freeway exits and is also a control city: Research Triangle Park in North Carolina.
Durham and Research Triangle Park are the control cities on NC-147 southbound (Durham Freeway). RTP should have also been the control city for I-885 southbound as well, but instead RDU Airport is the control city (which is better accessed using US-70 to I-540).
RTP now boasts a total of *8* exits on the Interstate system, including its own Interstate junction:
- I-885/Toll NC-885 (I-40 Exit 279A-B)
- Davis Drive (I-40 Exit 280)
- Miami Boulevard (I-40 Exit 281, not marked for RTP) - main exit for RTP on I-40
- Page Road (I-40 Exit 282, not marked for RTP)
- NC-540 West (to Toll NC-540) (I-40 Exit 283, not marked for RTP)
- East Cornwallis Road/Research Triangle Park (I-885 Exit 6)
- T. W. Alexander Boulevard (I-885 Exit 7, not marked for RTP) - main exit for RTP on I-885
- Ellis Road (I-885 Exit 8, not marked for RTP)
RTP also has one other freeway exit:
- Davis Drive/Hopson Road (Toll NC-885 Exit 2)
It is mind-blowing that the two "main exits" for Research Triangle Park are not marked as such. I think that is due to the fact that the headquarters of RTP is located near the intersection of Davis Drive and East Cornwallis Road, and only one of those [three] exits is specifically signed for Research Triangle Park itself.
Plus, RTP is missing a former exit. The former end of NC-147 at T. W. Alexander (south of NC-54) was permanently closed during the construction of that portion of the Triangle Expressway (then Toll NC-147, now Toll NC-885). That eliminated the only freeway access to NC-54, a major corridor running along the south side of Research Triangle Park parallel to I-40. Nowadays, you have to use the Davis Drive exit or the South Miami Boulevard exit.
Research Triangle Park covers about 7,000 acres. I don't have access to a good map with true jurisdictional boundaries, but I'm pretty sure that most of RTP is still unincorporated (from a governmental point-of-view). But if I recall correctly, there is a little bit of overlap with the City of Durham, and then parts of RTP are bounded by the sprawl of Raleigh, Cary and Morrisville city limits.