ISO 3166 Country Codes. Data pulled from Wikipedia / hacky PowerShell script used to grab data included

Get-Iso3166Csv.ps1

clear-host
$data = Invoke-RestMethod -Method Get -Uri 'https://en.wikipedia.org/wiki/List_of_ISO_3166_country_codes'
$a = $data.SelectNodes('//*[local-name() = ''table''][./@class=''wikitable sortable'']//*[local-name() = ''tbody'']//*[local-name() = ''tr''][./*[local-name() = ''td'']]') | %{
    [pscustomobject]@{
        Name      = $_.SelectSingleNode('(./*[local-name() = ''td''][1])[1]').InnerText -replace '^\s+','' -replace '\s+$',''
        FullName  = $_.SelectSingleNode('(./*[local-name() = ''td''][2])[1]').InnerText -replace '^\s+','' -replace '\s+$',''
        Alpha2    = $_.SelectSingleNode('(./*[local-name() = ''td''][4])[1]').InnerText -replace '^\s+','' -replace '\s+$',''
        Alpha3    = $_.SelectSingleNode('(./*[local-name() = ''td''][5])[1]').InnerText -replace '^\s+','' -replace '\s+$',''
        Num       = $_.SelectSingleNode('(./*[local-name() = ''td''][6])[1]').InnerText -replace '^\s+','' -replace '\s+$',''
    }
}
#very basic/hacky cleansing
$a = $a `
    | ?{$_.Name -notlike '* – Please see *'} `
    | %{$_.Name = $_.Name -replace '\u200a.*$',''; $_} `
    | %{$_.Alpha2 = $_.Alpha2 -replace [Regex]::Escape('.mw-parser-output .monospaced{font-family:monospace,monospace}'),''; $_}
#output results (on screen)
$a | Select-Object Alpha2, Alpha3, Num, Name, FullName | ConvertTo-Csv -NoTypeInformation

ISO3166.csv

For anyone hitting this looking for a way to get these values into PowerShell / .Net scripts (including for use with AD attributes c, co, countrycode), there's a NuGet/PSGallery solution that you may be interested in: https://github.com/ilyabreev/Bia.Countries