If you are determined to have an automated method, you can find
neighbors using
this approach.
Then look for counties with no neighbors. For these counties look
for the closest counties in the same state and add these to the
list.
But that seems like a lot of work for a small problem. A cursory
search suggests the number of island counties is quite small and you
can patch up the data by hand:
1. Hawaii (All 5 Counties)
As the only state located entirely on
an archipelago, all its counties are island-based.
-
Hawaii County: The "Big
Island."
-
Honolulu County: Oahu and
the Northwestern Hawaiian Islands.
-
Kalawao County: A small
peninsula on Molokai (the smallest county in the US).
-
Kauai County: Kauai,
Niihau, and others.
-
Maui County: Maui, Lanai,
Molokai, and Kahoolawe.
2. Washington (2 Counties)
While most of Washington is on the
mainland, its northwestern corner is home to:
3. Massachusetts (2 Counties)
4. New York (2 Counties)
Technically, two of New York City's
boroughs are their own island counties:
-
Richmond
County (Staten Island): Comprised of Staten Island
and surrounding smaller islets.
-
New
York County (Manhattan): Comprised of Manhattan
Island, Roosevelt Island, and others. (Note: A tiny 0.1
sq mile neighborhood called Marble
Hill is physically on the mainland due to a canal
being dug in 1895, but it remains legally part of the
island county).
5. Rhode Island (1 County)
-
Newport
County: While some of its towns are on the
mainland, the county itself is largely defined by Aquidneck
Island, Conanicut Island, and Prudence
Island. However, it is often excluded from
"entirely island" lists because a portion of the county
(the town of Little Compton and Tiverton) is physically
attached to the Massachusetts mainland.
6. Florida (1 County*)
-
Monroe
County: This is a "hybrid" case. While the
populated Florida Keys are entirely
islands, the county boundaries actually extend onto the
mainland to include a large, uninhabited portion of the
Everglades.
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