How to Read the HUD-USPS ZIP Crosswalk Files: There are six types of crosswalk files available for download. The first 3 crosswalk files are used to allocate ZIP codes to Census tracts, counties or Core Based Statistical Areas (CBSA). The last three are used to allocate Census tracts, counties or Core Based Statistical. ZIP Code Tabulation Areas (ZCTAsTM) are a statistical entity developed by the U.S. Census Bureau for tabulating summary statistics from Census 2000. This concept was developed to overcome the difficulties in precisely defining the land area covered by each ZIP Code®.

• Zip Code Msa Crosswalk Sign Code
• Zip Code Msa Crosswalk Sign In Page

My problem is that I have a file with thousands of cities and I want to map city names to (Metropolitan Statistical Areas and the MSA equivalent for non-US cities. There have been a bunch of posts here on similar questions. I'm using Python if that helps (ie in case there is a python package available similar to how the googlemaps python package works..)

1. Mapping Cities to Zip Codes. There is a good answer here that provides a csv with zip codes for every city in the US. But because the census data is published mapping US counties to MSA's, instead of US cities, I would still need to find a way to map back from zip codes to US cities.

2. Database of US Cities to MSA This is essentially my question (at least the US portion), but it was not answered to the satisfaction of the poster, or my question.

3. Google's Geocoding Developer Site The Google Geocoding developer's site has a useful CSV that has some US cities mapped to a Google Metro Region code. The problem is that it is not MSA. The old Google csv, downloadable here does not say how the metro coding system was created. The site also has a link to the new Google coding system based on Nielsen's DMA (designated market area) coding system.

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I'm really just looking for a csv file that has city, state (if US), country, region code. Where region code is based on well-regarded standard (the US Census Bureau's MSA would be ideal for US cities, and having non-US country's census classifications for non-US cities would be ideal too). Does such a file exist? Alternatively, is there a python package that connects to some database such that I run my script on my input file and it outputs the corresponding region code?

Thanks very much!

ANSWER

For anyone interested, here is a pretty good file that maps US cities to counties: http://www.census.gov/statab/ccdb/ccdbcityplace.html

1 Answer

I was on the hunt for a similar MSA-level resource and discovered this map at the CartoDB website: https://common-data.cartodb.com/tables/cb_2013_us_cbsa_5m/public/map

You can download several different formats, including GeoJSON and CSV. Here's a screenshot that shows the type and values of the data exported in CSV (since that was the original poster's requirement):

I hope this is helpful to others who come across this post!

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My and team and I ran a series of zip codes from addresses within our data set against MSA to Zip Code data found on The Census' website here. We found that a relatively high number of the addresses did match, or potentially fall within the limits of any MSA. However, we want to verify that in fact the 1000 or so address that did fall within any MSA based on Census data simply do not lie within the geometric bounds of any particular MSA. What tool could I use to verify this?

For example, If I have a series of addresses that I ran through an algorithm to retireve their Lat Long points, I could use something like LatLong.net to verify the correctness of the said algorithm to some degree.

Is there an equivalent tool other than say using PostGIS and running the Lat Longs through a geometric comparison function within Postgres (Our database is a Postgres DB by the way)? I am not well versed in PostGIS to know offhand how use it to solve this problem.

Thanks in advance.

Zip Code Msa Crosswalk Sign Code

1 Answer

Solved. We lucked out in finding a list of MSAs (Metropolitan Statistical Area) and every zip code within that MSA. Thus the mapping could then be handled with our database. But this issue was about how to go about mapping MSA data to the address data that we have. And the answer was that we needed a key to map them together and this file provides that key - the zip code.

Zip Code Msa Crosswalk Sign In Page

I hope this file and idea help anyone else out with a similar issue with say Micropolitan Statistical Areas for example.

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