The $1.9 billion, Medford, N.Y.-based credit union’s Southhampton branch is also located just five miles from Water Mill, N.Y., which comes in fifth on RealtyHop’s list of the most expensive U.S. zip codes (11976). The median home price in this hamlet and census-designated place within the Town of Southampton on Long Island is $5.3 million.

2. Meridian Trust Federal Credit Union’s Meridian-Jackson Branch

Aside from Suffolk CU, Meridian Trust ($700 million, Cheyenne, Wyo.), is the only other credit union on this list with a branch within about 10 miles of not one, but two top-10 most expensive U.S. zip codes. Its Meridian-Jackson Branch at 740 S. US Highway 89 in Jackson, Wyo., is located just over 11 miles from Teton Village, Wyo., and just over six miles from Wilson, Wyo.

Teton Village is home to the 83025 zip code, which is the sixth most expensive zip code in the U.S. (median home price: $5 million), while Wilson comes in at number nine with the zip code 83014, where median home prices are $4.37 million.

3. Monterra Credit Union’s North Fair Oaks Branch

The $1.8 billion, Redwood City, Calif.-based Monterra takes home the prize for operating the branch closest to the nation’s most expensive zip code, 94027, which is home to the Silicon Valley town of Atherton, Calif., and boasts a median home price of $7.75 million. Monterra’s North Fair Oaks Branch at 3117 Middlefield Rd. in Redwood City is located 1.4 miles from the pricey zip code.

4. SRI Federal Credit Union’s Main Office

Coming in at a very close second to Monterra’s North Fair Oaks Branch for holding the title of “closest to the most expensive U.S. zip code” is the main office of SRI FCU ($238 million, Menlo Park, Calif.). Located at 333 Ravenswood Ave. in Menlo Park, it’s 1.5 miles from Atherton.

5. Stanford Federal Credit Union’s Redwood City Branch

There is no shortage of credit union branches close to Silicon Valley wealth, as the next three branches also made this list for their proximity to Atherton. The first is Stanford FCU ($4.3 billion, Palo Alto, Calif.), whose Redwood City Branch at 905 Barron Ave. is 2.2 miles from Atherton.

6. Polam Credit Union’s Main Office

Next up we have Polam, a small Redwood City-based credit union with $75.5 million in assets. Its main office, located at 770 Marshall St in Redwood City, is 2.6 miles from Atherton.

7. Patelco Credit Union’s Redwood City Branch

Rounding out the list of credit unions with branches adjacent to the nation’s priciest residential real estate is the $9.4 billion, Dublin, Calif.-based Patelco. Its Redwood City Branch at 1105 Veterans Blvd. is 2.9 miles from the 94027 postal code.

8. EdFed Credit Union’s Downtown Miami Branch

The country’s second-most expensive zip code, 33109, is located on Florida’s Fisher Island, which is south of Miami Beach and only accessible by ferry or private yacht. Median home prices there are $6.1 million, and while no credit union branch can be found on the island, three credit unions operate branches to the west in Miami, all within 7.5 miles of the island.

The first is Educational Federal Credit Union ($1.7 billion, Miami), which operates its Downtown Branch 4.9 miles from the 33109 zip code.

9. Miami Federal Credit Union’s Wilkie Branch

Located 7.1 miles from Fisher Island is the Wilkie Branch of the $43.4 million, Miami-based Miami FCU, located at 400 N. Miami Ave.

10. Dade County Federal Credit Union’s Downtown Miami Branch

The $1.4 billion, Sweetwater, Fla.-based Dade County FCU operates a branch at 111 NW 1st St. in downtown Miami – 7.4 miles from the 33109 zip code.

11. Five Star Credit Union’s St. Simons Island Branch

One of two Southern U.S. zip codes to make RealtyHop’s list of the country’s most expensive, 31561 is located on Georgia’s Sea Island, off the southern coast of the state. Coming in at number four on the list, the median price of a home on Sea Island is $5.5 million.

Located four miles from the island on an adjacent island, St. Simons, is a Five Star branch at 95 Cinema Lane. Five Star is $1.2 billion credit union with headquarters in Dothan, Ala.

12. Santa Barbara County Federal Credit Union’s Main Office

Located just west of Santa Barbara, Calif., on the Southern California coast sits Montecito and the zip code of 93108, which, with a median home price of $4.85 million, is the country’s eighth most expensive zip code. There’s one credit union within a 10-mile radius of this high-priced community – the $63 million Santa Barbara FCU, whose main office (and sole location) is 8.4 miles away at 2623 De La Vina St. in Santa Barbara.

13. BECU’s Downtown Bellevue Branch

The 10th most expensive U.S. zip code, according to RealtyHop’s list, is in the Pacific Northwest. It’s 98039, or Medina, Wash., a community located on a peninsula in Lake Washington on the opposite shore of Seattle, where the median home price is $4.2 million.

Four credit unions currently operate branches within about four miles of this affluent Seattle suburb. The first is BECU ($49.4 billion, Tukwila, Wash), which runs a location at 200 Bellevue Way NE in the Medina-adjacent Bellevue 2.9 miles away.

14. First Tech Federal Credit Union’s Downtown Bellevue Community Experience Center

Also located 2.9 miles from Medina, the $17 billion, San Jose, Calif.-based First Tech operates a Community Experience Center at 555 108th Ave. NE in Bellevue.

15. WSECU’s Bellevue Branch

The $5.2 billion, Olympia, Wash.-based Washington State Employees Credit Union also operates a branch in Bellevue. It’s at 155 108th Ave NE, three miles from Medina.

16. Salal Credit Union’s Bellevue Branch

Rounding out our list of credit unions with branches adjacent to the most expensive place to live in Washington State is Salal ($1.1 billion, Seattle). Its Bellevue branch is located at 1048 116th Ave NE, 4.1 miles from the 98039 zip code.