[bgill]

The US Census is not released until after 70 years. I haven’t a clue about the Polk. I recall there used to be city directories that had listings similar to it. Perhaps Polk just recopied those?

[RummyChick]

from polk- probably the same way you see stuff from Intellius.

Our consumer information:

We scrutinize and catalog 4,300 telephone directories.
Data specialists examine each listing and enhance it with buying habit
and lifestyle information from real estate transactions, product
registrations, magazine subscriptions, and survey responses.
Every month, we match and clean the data with the USPS National
Change of Address (NCOA), ZIP+4 and Delivery Sequence File to
standardize and keep the addresses accurate.

Our business information:

We scrutinize and catalog 5,200 phone books, annual reports and other
business directories to find information on nearly every business in the
nation.
We hand-key each record and call every business to make sure you have
the most reliable information available.
Next, we add public record data from county courthouse filings, SEC and
10k filing, and Secretary of State data.
Every month, we match and clean the data with the USPS National
Change of Address (NCOA), ZIP+4 and Delivery Sequence File to
standardize and keep the addresses accurate.

[El Gato]

I recall there used to be city directories that had listings similar to it. Perhaps Polk just recopied those?

Polk *was* and is one of those, in many cities.

I would think someone went to the libraries in Hawaii and Seattle and looked at and photographed, old editions from '61.