My original idea to replicate authentic mid-century address numbers was to do an Eichler-style address plaque, and if I can find the right numbers, that's still the plan. But the mid-century address numbers I had in mind are sold out at the one source I could find. So I went hunting for new mid-century modern address numbers. I'm not sure I've found the perfect house numbers for my mid-century ranch, but any of these would look good on your mid-century modern home.
Neutra address numbers from Modern Dwell Numbers
Avalon modern house numbers from Atlas Homewares
Domicile house numbers from Chiasso
Paragon modern house numbers from Atlas Homewares
Palm Springs address numbers from Modern House Numbers
Metropolitan Retro modern house numbers from Atlas Homewares. These would be perfect for any atomic ranch home.
Neutra address numbers and Eames address numbers from Heath Ceramics
A modern address plaque from Modplexi
If you have glass on or near your door, there's this Helvetica address number window cling from House Number Lab
Side note: I tried to limit these mid-century modern address number options to a budget that I thought was reasonable (~$20 per number). If you're willing to spend more than that (upwards of $100 a number) there are plenty of other options out there, including custom numbers in almost any font.