If you have the names of possible victims from whatever source you can check them out on the Commonwealth War Graves Commission site - www.cwgc.org - it lists known civilian casualties as well as those from the armed forces.
You can also search by cemetery - so if you suspect that the majority of local casualties would have gone to one or other cemetery, you can look for the grouped records that way. The cemetery records are alphabetical, so members of the same family dying in a single bombing would be next to each other, but if you're looking for records over a number of houses, you would have to search the entire entry for a particular cemetery to be sure of getting everybody.
As an example East Ham Borough Cemetery has 136 records over 7 pages of civilian casualties.