1. Boston, Massachusetts: Often nicknamed "The Mecca", Greater Boston is home to one of the largest concentration of Irish Travelers in the US. Communities that were built by Irish Traveler families still exist in some of Boston's neighborhoods.
2. New York City, New York: In New York City, a significant Irish Traveler community is found in the neighborhood of the Bronx.
3. Philadelphia, Pennsylvania: Philadelphia is home to a sizeable Irish Traveler population, who have resided there for generations.
4. Chicago, Illinois: Chicago has a long-standing Irish Traveler presence, with some communities dating back to the early 20th century.
5. San Francisco Bay Area, California: In California, Irish Travelers are mainly found in the Bay Area, particularly in San Francisco and San Jose.
These areas have historically attracted significant numbers of Irish Travelers, who have often arrived and settled in these regions based on economic opportunities, family ties, and community networks.
It's important to note that not all Irish Travelers are based in the aforementioned locations. They may also be found in other cities and states across the US, but the areas mentioned above represent some of their traditional and long-established communities in the country.