1. There is precisely 1 state that has NO straight line borders. Identify the state.

Hawaii

2. Name all the cities and the concerned states where the first letter of the name of the capital city is the same as the first letter of the state.

Delaware:Dover, Hawaii:Honolulu, Indian:Indianapolis, Oklahoma:Oklahoma City, 

3. Which state is bordered by a maximum number of neighboring states?

Tennessee and Missouri tie at eight each

4. Which state has the longest coastline in the US?

Alaska

5. Which state's name has 4 consecutive consonants in it?

New Hampshire

6. Which is the ONLY US city whose name can be spelled completely with vowels?

Aiea, Hawaii (just west of Honolulu)

 

7. Which is the only US state that borders on precisely one state?

Maine (w/ New Hampshire)

8. Which states have coastline access to the Pacific Ocean?

Hawaii, Alaska, Washington, Oregon, California

9. Name the only US city to celebrate Halloween on October 30 instead of October 31.

Lancaster, Pennsylvania (and, indeed, all of Lancaster County) suggests Trick-or-Treating to be held 6-8pm the Friday before the 31st, whenever the 31st occurs on a Saturday, Sunday (e.g., 2020, 2021, 2026, 2027). So the festivities could be on the 29th or 30th. This may date from when DST ended on the last Sunday of October. The 2005 onward extension was motivated in part by lobbyists from the candy industry.

https://en.wikipedia.org/wiki/Daylight_saving_time#History

10. How many states have a shoreline on the Atlantic Ocean without considering the Gulf of Mexico? 

Nine: Delaware, Florida, Maine, North Carolina, Maryland, New Jersey, New York, South Carolina, Virginia

What would be the total count if coastal states having a shoreline on the Gulf of Mexico are also considered?

Four more: Texas, Louisiana, Mississippi, and Alabama. Florida has shores on both bodies of water. 

11. Of the lower(contiguous) 48 states, which state has the longest border with Canada?

Michigan 

12. Which state has the northernmost point in the 48 contiguous states?

Minnesota (the Northwest Angle inlet)