Get URL(s) for FTP site folder(s) with ACS 5-year summary file data

Returns URLs of folders on Census Bureau FTP site with zip files based on end year.

Usage

url.to.find.zipfile(
  mystates,
  end.year = acsdefaultendyearhere_func(),
  url.prefix
)

Arguments

mystates: Character vector of one or more states/DC/PR, as 2-character state abbreviations. Default is all states/DC/PR.
end.year: Optional end year for 5-year summary file, as character, but ignored if url.prefix is specified
url.prefix: Optional character element that defaults to what is returned by [get.url.prefix](end.year)

Value

Returns character vector that is URL(s) such as "ftp://ftp.census.gov/acs2012_5yr/summaryfile"

Details

See help for download.lookup.acs() for more details on the URLs used for the data.

The zip files look like this for example: "20135dc0001000.zip"

The 2009-2013 summary file by state-seqfile combo is in folders that look like this:

ftp://ftp.census.gov/acs2013_5yr/summaryfile/2009-2013_ACSSF_By_State_By_Sequence_Table_Subset/DistrictOfColumbia/Tracts_Block_Groups_Only

also see "https://www2.census.gov/programs-surveys/acs/summary_file/2022/table-based-SF/data/5YRData/"

The 2008-2012 summary file by state-seqfile combo is in folders that look like this:

http://www2.census.gov/acs2012_5yr/summaryfile/2008-2012_ACSSF_By_State_By_Sequence_Table_Subset/Alabama/Tracts_Block_Groups_Only

The 2007-2011 summary file by state-seqfile combo is in folders that look like this:

ftp://ftp.census.gov/acs2011_5yr/summaryfile/2007-2011_ACSSF_By_State_By_Sequence_Table_Subset/DistrictOfColumbia/Tracts_Block_Groups_Only/
URL must be the ftp site, not the http version.

http version was here http://www2.census.gov/acs2011_5yr/summaryfile/2007-2011_ACSSF_By_State_By_Sequence_Table_Subset/DistrictOfColumbia/Tracts_Block_Groups_Only/