Sioux City, IA
Along Primary Interstates: I-29
Along US Numbered Highways (<=5mi): US-20, US-75
Along Auxiliary Interstates:
From: Council Bluffs, IA - 99.3 miles
To: Sioux Falls, SD - 87.8 miles
Diversion: 3.7 miles
From: St Joseph, MO - 224.1 miles
To: Fargo, ND (Permit) - 328.1 miles
US-20
From: Lusk, WY - 455.5 miles
To: Dubuque, IA - 298.5 miles
To: Dows, IA (US-20, I-35) - 163.5 miles
The prospects for I-29 seem to be improving.
If this and all other locations known are built, there'd only be the gap between Sioux Falls, SD and Fargo, ND to go.
One day the US Numbered Highways will also have Supercharger coverage, but, one step at a time.
That was July 2019.
Now:
Sioux City, IA
Along Primary Interstates: I-29
Along US Numbered Highways (<=5mi): US-20, US-75
Along Auxiliary Interstates: None
I-29
From: Council Bluffs, IA - 98.9 miles
To: Sioux Falls, SD - 88.1 miles
Diversion: 3.6 miles
From: St Joseph, MO - 223.9 miles
To: Watertown, SD (Permit) - 189.1 miles
To: Fargo, ND - 328.4 miles
US-20
From: Lusk, WY - 455.3 miles
To: Waterloo, IA (Permit) - 210.5 miles
Diversion: 0.5 miles
From: Evansville, WY - 555.1 miles
To: Dubuque, IA - 298.3 miles
Other neighbors:
To: Worthington, MN (US-75, IA-60/MN-60, US-59) - 101.4 miles
To: Dows, IA (US-20, I-35) - 163.5 miles
To: Shelby, IA (I-29, I-680, I-80) - 99.4 miles
To: Lincoln, NE (I-29, I-680, I-80) - 145.4 miles
A bit of change and some more detail.