1651 is not a country code. Numbers inside a country start like this: Cottage Grove, MN (United States). The first digit 1 is the trunk prefix for domestic calls and is dropped from abroad.
Have the full number? Check it in the number lookup.
| Area or operator | From abroad | Inside the country |
|---|---|---|
 Cottage Grove, MN · United States | +1 651 … | 1651 … |
| Eagan, MN · United States | +1 651 … | 1651 … |
| Farmington, MN · United States | +1 651 … | 1651 … |
| 12 more in United States | ||
| Area or operator | From abroad | Inside the country |
|---|---|---|
| Cottage Grove, MN · United States | +1 651 … | 1651 … |
| Eagan, MN · United States | +1 651 … | 1651 … |
| Farmington, MN · United States | +1 651 … | 1651 … |
| 12 more in United States | ||
| Area or operator | From abroad | Inside the country |
|---|---|---|
 Malorita, Brest Region · Belarus | +375 1651 … | 81651 … |
 Oldmeldrum · United Kingdom | +44 1651 … | 01651 … |
If a number starts with +, the first 1–3 digits are the country code. If it starts with 0 (8 in Russia and Kazakhstan), it is a domestic number: an area or operator code follows, and from abroad the 0 or 8 is replaced with + and the country code. The same digits can mean different places, so where the call came from matters.