|Lower left quadrant of 1948 map|
The two exceptions to this that I've come across are the circa 1941 New Castle County Bus Map and the 1948 map shown here. This is actually only a quarter of the entire map, the lower left quadrant to be exact, it doesn't have names of property owners like the earlier ones, but there are several things on and about it that make it interesting enough to take a closer look at.
First of all, it comes from a transitional time in the history of Mill Creek Hundred (and the rest of the Wilmington suburbs, for that matter). 1948 was right near the beginning of the post-war suburban expansion in MCH, and the map reflects that. There are a few new developments shown (Kiamensi Gardens, for example), but not many. You can see the suburbs expanding out of Newport and Elsmere, but for the most part things are pretty clear west of the Red Clay.