It is no distance.
DM and WDM share a boundary, DM's 63rd Street is WDM's 1st Street.
https://maps.Google.com/maps?q=63rd+and+grand,+des+moines&hl=en&ll=41.582708,-93.703337&spn=0.015954,0.038409&sll=37.0625,-95.677068&sspn=34.587666,78.662109&t=h&hnear=Grand+Ave+%26+63rd+St,+Des+Moines,+Polk,+Iowa+50312&z=15
OTOH, some parts of DM are a long way from some parts of WDM.
1028 miles
The driving distance from Davenport, Iowa to Des Moines, Iowa is 167 miles via I-80 W per MapQuest. The driving time per MapQuest is 2 hours and 35 minutes.
It is 671.60 miles according to MapQuet.
627 miles
It is 113.63 miles according to MapQuest.
Des Moines is the capital of Iowa and is the most populous city. Starting from Des Moines, Iowa it is 1,200 miles to the Atlantic Ocean.
It is 850.79 miles according to MapQuest.
It is 86.73 miles according to MapQuest.
It is 919 miles according to MapQuest.
45 feet
It is 568.02 miles according to MapQuest.
It is 293.88 miles according to MapQuest.