Port Barrington (also referred to as Fox River Valley Gardens or FRG) is a village in Lake and McHenry counties in the U.S. state of Illinois. It was formerly known as Fox River Valley Gardens, but the name was changed in 2002 to Port Barrington. The population was 1,517 at the 2010 census,[3] up from 788 in 2000.

The village of Port Barrington was incorporated in 1969 under the name Fox River Valley Gardens. At the time, the village had the longest name out of all other incorporated places in Illinois, and was one of the longest town names in the country. For 33 years, Port Barrington shared a ZIP code (60010) with the village of Barrington, 9 miles (14 km) to the south. In 2002, the village established its own post office and zip code. Homeowners in the new Riverwalk subdivision claimed that their home values fell significantly and immediately when their addresses were changed to “Fox River Valley Gardens”. Some people trying to sell their homes at the time found themselves “underwater” (selling at a loss). This prompted residents in the Riverwalk section of the village to express their objection to what appeared to be a “bait and switch” in the change of mailing address. There were several tense village meetings where legal action was being considered by the new residents. In September 2002, the village board voted 4–3 in September 2002 to re-incorporate and change the community’s name to “Port Barrington”. However, several addresses in the older section of the village are still listed under the name Fox River Valley Gardens. In addition, many road signs and maps continue to use the community’s original name, as do the local police and fire departments. As of 2019, the post office is no longer in service, and mail delivery is provided by the postal service in Island Lake, Illinois.