The first migration to America, were Ulster Scots who lived in Northern Ireland for four generations or more, and who were quite a different people from the Irish.

The first Scotch Irish first began coming to the New World in the early 1600's, They were so reproductive that they dominated and reigned supreme in very place they choose to dwell. These initial settlers were a hearty lot who, lived off the land, making do with materials on hand and constructing their homes of logs.

Boyne Falls, Michigan, US
County: Charlevoix County
Location: 45:10:01N 84:54:49W
Population (1990): 369

Ulster, Pennsylvania, US
County: Bradford County
Location: 41:50:45N 76:30:08W
Elevation: 741 feet

Orangemans Hill, Illinois, US
County: Mercer County
Location: 41:18:49N 90:36:29W

Scotch Plains, New Jersey, US
County: Union County
Location: 40:37:59N 74:22:25W
Population (1990): 21160
Elevation: 151 feet

Scotchtown, New York, US
County: Orange County
Location: 41:28:34N 74:22:07W
Population (1990): 8765
Elevation: 725 feet

Scotia, New York, US
County: Schenectady County
Location: 42:49:55N 73:57:39W
Population (1990): 7359

Scotia, Nebraska, US
County: Greeley County
Location: 41:28:06N 98:42:09W
Population (1990): 318

Scotia, Arkansas, US
County: Pope County
Location: 35:19:52N 93:17:32W
Elevation: 380 feet

Scotch Range, South Carolina, US
County: Dorchester County
Location: 33:00:59N 80:17:05W
Elevation: 50 feet

Scotch Hollow, Pennsylvania, US
County: Clearfield County
Location: 40:52:11N 78:18:09W
Elevation: 1645 feet

King William, Virginia, US
County: King William County
Location: 37:41:14N 77:00:50W
Elevation: 142 feet

Scotch Point, Maryland, US
County: St. Mary's County
Location: 38:20:08N 76:30:42W
Elevation: 25 feet

Scotia, Missouri, US
County: Crawford County
Location: 38:01:40N 91:12:49W

Scotch Coulee, Montana, US
County: Carbon County
Location: 45:09:50N 109:12:45W
Elevation: 4982 feet

Scotch Bonnet, New Jersey, US

County: Cape May County
Location: 39:04:06N 74:47:18W
Elevation: 5 feet

Scotchbrush, New York, US
County: Fulton County
Location: 43:04:18N 74:34:27W

Scotch Bush, New York, US
County: Montgomery County
Location: 42:51:27N 74:11:45W

Scotch Hill, New York, US
County: Otsego County
Location: 42:40:23N 75:03:54W
Elevation: 1647 feet

Scotch Church, New York, US
County: Montgomery County
Location: 42:52:18N 74:08:08W

Scotch Ridge, Ohio, US
County: Wood County
Location: 41:24:09N 83:31:23W
Elevation: 661 feet

Scotch Hill, Pennsylvania, US
County: Clarion County
Location: 41:19:36N 79:15:56W
Elevation: 1500 feet

Scotchville, Georgia, US
County: Camden County
Location: 30:46:08N 81:37:03W
Elevation: 21 feet

Scotchtown, Indiana, US
County: Sullivan County
Location: 39:04:30N 87:17:52W
Elevation: 512 feet

Scotch Grove, Iowa, US
County: Jones County
Location: 42:10:22N 91:06:27W

Scotch Ridge, Iowa, US
County: Warren County
Location: 41:28:21N 93:33:30W

Scotchtown Hills, Maryland, US
County: Prince George's County
Location: 39:06:12N 76:53:10W
Elevation: 340 feet

Scotchtown, Virginia, US
County: Hanover County
Location: 37:50:39N 77:35:13W
Elevation: 300 feet

Scotch Hill, West Virginia, US
County: Preston County
Location: 39:22:27N 79:51:58W
Elevation: 1666 feet

Scotchmans Glen, Maryland, US
County: Cecil County
Location: 39:27:15N 75:53:43W
Elevation: 80 feet

Scotia, California, US
County: Humboldt County
Location: 40:28:57N 124:05:59W
Elevation: 164 feet

Additional information from Pete in the USA.

You have most of the towns on your map, but I am also aware that Ardara, Co. Donegal is also a town in Westmoreland County. I also remember a Newtown Hamilton of Co. Armagh one the map once in south central Pennsylvania. Newer maps don't seem to have it so maybe the town name was changed over the past few years.Besides towns, Pennsylvania also has numerous townships with Ulster place names. I may be missing more because there are so many, but here is a list of the following townships in Pennsylvania bearing Ulster placenames of which I am aware:

Antrim Township--Franklin Township
Armagh Township--Mifflin County
Fermanagh Township--Juniata County
Monaghan Township--York County
Londonderry Township--Chester County
Londonderry Township--Bedford County
Londonderry Township--Dauphin County
North Londonderry Township--Lebanon County
South Londonderry Township--Lebanon County
Derry Township--Dauphin County
Derry Township--Mifflin County
Derry Township--Westmoreland County
Donegal Township--Butler County
Donegal Township--Westmoreland County
Donegal Township--Washington County
East Donegal Township--Lancaster County
West Donegal Township--Lancaster County
Tyrone Township--Perry County
Tyrone Township--Blair County
Tyrone Township--Adams County
Upper Tyrone Township--Fayette County
Lower Tyrone Township--Fayette County

Belfast Township--Fulton County
Colerain Townahip--Lancaster County
Colerain Township--Bedford County
East Drumore Township--Lancaster County
West Drumore Township--Lancaster County
North Strabane Township--Washington County
South Strabane Township--Washington County
Straban Township--Adams County
Lurgan Township--Franklin County
Letterkenny Township--Franklin County
Rapho Township--Lancaster County (Raphoe, Co. Donegal)

I have a feeling I may be missing a few more townships, but that is most of
them. You will also find Irish placenames outside of Ulster, but I suspect that
they too have Ulster or at least Protestant heritage behind them. For
example, you will find at least the following:

Sligo--Clarion County
Dublin--Bucks County
Dublin Township--Huntingdon County
Dublin Township--Fulton County
Upper Dublin Township--Montgomery County
Ardmore--Montgomery County (Ardmore is a town in Wexford. I understand that
this "Ardmore" came from Irish Quakers or Scots Irish settlers who gave this
town that name to compete with it with bordering town of "Bryn Mawr", a town
in which was settled and named by Welsh Quakers. Bryn Mawr is also a town
in Wales. Ardmore and Bryn Mawr mean "high hill")
Avoca--Lackawanna County
Dunmore--Lackawanna County (named after Lord Dunmore. Dunmore is in Co.
Galway)
Waterford--Erie County
Waterford Township--Erie County
Wexford--Allegheny County
Limerick--Montgomery County
Limerick Township--Montgomery County

Along with the Plantation of Ulster, there was also the Plantation of Munster at the same time. It was an attempted two-fold process where only the Ulster Plantation eventually took hold. Many people do not know this fact. The Munster Plantation primarily took place in Limerick, where there still remains today a notable number of Protestants. The Munster Plantation were largely located there from Great Britain and the Palatine (Calvinists) region of Germany. Many of these Protestants came to America, especially the Palatines and Quaker settlers. I suspect this is the origin of Limerick and Limerick Township in Montgomery County, Pennsylvania. Many Protestants also were found in Dublin and in Waterford and Wexford at that time period; hence names like Avoca, Wexford and Waterford. Many Irish Protestant Quakers settled near Philadelphia along with Scots Irish.

This also may account for names. The town of "Sligo" in Clarion County and the Fulton and Huntingdon County townships of "Dublin" appear in the Appalachia area where most Scots Irish settled, and these townships are surrounded by other Ulster placenames, so I suspect they were likely named by Scots Irish. Again, I may be missing more names. There are so many of them in Pennsylvania. The street names, farm and housing developments bearing Irish placenames are far more omninous, but it is safe to say you can find most towns in Ulster and the rest of Ireland in extensive numbers. Heck, for example there are several Irish street names and housing developments with names like Tyrone, Ballynahinch (Cos. Down and Mayo) and Tullamore (Co. Westmeath) in my area just to name a few.

I hope you can add these to your site or map. You spent so much time on it that I hope this may help to you.

Cheers,

Pete.