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    <p>You should definitely checkout GeoNames. They have the entire world in a standardized database. You can <a href="http://download.geonames.org/export/dump/" rel="noreferrer">download it</a> or use their <a href="http://www.geonames.org/export/web-services.html" rel="noreferrer">API</a>.</p> <p>I download the US database and use a connector I created in C# to insert States, Cities, Towns, and Zip Codes in my database.</p> <pre><code> public static class GeoNamesConnector { #region GeoName Constants private static readonly string GeoNamesPath = HttpContext.Current.Server.MapPath("~/App_Data/GeoNames/US.txt"); const int GeoNameIdColumn = 0; const int NameColumn = 1; const int LatitudeColumn = 4; const int LongitudeColumn = 5; const int FeatureCodeColumn = 7; const int CountryCodeColumn = 8; const int Admin1CodeColumn = 10; const int Admin2CodeColumn = 11; #endregion #region AlternateName Constants private static readonly string AlternateNamesPath = HttpContext.Current.Server.MapPath("~/App_Data/GeoNames/alternateNames.txt"); const int AlternateNameIdColumn = 0; const int AltNameGeoNameIdColumn = 1; const int IsoLanguageColumn = 2; const int AlternateNameColumn = 3; #endregion public static void AddAllEntities(GeoNamesEntities entities) { //Remember to turn off Intellitrace Stopwatch stopwatch = new Stopwatch(); stopwatch.Start(); var geoNamesSortedList = AddGeoNames(entities); Trace.WriteLine(String.Format("Added GeoNames: {0}", stopwatch.Elapsed)); stopwatch.Restart(); SetupGeoNameChildRelationships(geoNamesSortedList, entities); Trace.WriteLine(String.Format("Setup GeoName parent/child relationships: {0}", stopwatch.Elapsed)); stopwatch.Restart(); AddPostalCodeAlternateNames(geoNamesSortedList, entities); Trace.WriteLine(String.Format("Added postal codes and relationships with parent GeoNames: {0}", stopwatch.Elapsed)); } private static SortedList&lt;int, GeoName&gt; AddGeoNames(GeoNamesEntities entities) { var lineReader = File.ReadLines(GeoNamesPath); var geoNames = from line in lineReader.AsParallel() let fields = line.Split(new char[] { '\t' }) let fieldCount = fields.Length where fieldCount &gt;= 9 let featureCode = fields[FeatureCodeColumn] where featureCode == "ADM1" || featureCode == "ADM2" || featureCode == "PPL" let name = fields[NameColumn] let id = string.IsNullOrEmpty(fields[GeoNameIdColumn]) ? 0 : int.Parse(fields[GeoNameIdColumn]) orderby id select new GeoName { Id = Guid.NewGuid(), GeoNameId = id, Name = fields[NameColumn], Latitude = string.IsNullOrEmpty(fields[LatitudeColumn]) ? 0 : Convert.ToDecimal(fields[LatitudeColumn]), Longitude = string.IsNullOrEmpty(fields[LongitudeColumn]) ? 0 : Convert.ToDecimal(fields[LongitudeColumn]), FeatureCode = featureCode, CountryCode = fields[CountryCodeColumn], Admin1Code = fieldCount &lt; 11 ? "" : fields[Admin1CodeColumn], Admin2Code = fieldCount &lt; 12 ? "" : fields[Admin2CodeColumn] }; var sortedList = new SortedList&lt;int, GeoName&gt;(); int i = 1; foreach (var geoname in geoNames) { sortedList.Add(geoname.GeoNameId, geoname); entities.GeographicAreas.AddObject(geoname); if (i++ % 20000 == 0) entities.SaveChanges(); } entities.SaveChanges(); return sortedList; } private static void SetupGeoNameChildRelationships(SortedList&lt;int, GeoName&gt; geoNamesSortedList, GeoNamesEntities entities) { foreach (var geoName in geoNamesSortedList.Where(g =&gt; g.Value.FeatureCode == "ADM2" || g.Value.FeatureCode == "ADM1")) { //Setup parent child relationship IEnumerable&lt;KeyValuePair&lt;int, GeoName&gt;&gt; children = null; switch (geoName.Value.FeatureCode) { case "ADM1": children = geoNamesSortedList.Where( g =&gt; g.Value.FeatureCode == "ADM2" &amp;&amp; g.Value.Admin1Code == geoName.Value.Admin1Code); break; case "ADM2": children = geoNamesSortedList.Where( g =&gt; g.Value.FeatureCode == "PPL" &amp;&amp; g.Value.Admin1Code == geoName.Value.Admin1Code &amp;&amp; g.Value.Admin2Code == geoName.Value.Admin2Code); break; } if (children != null) { foreach (var child in children) geoName.Value.Children.Add(child.Value); } entities.SaveChanges(); } } private static void AddPostalCodeAlternateNames(SortedList&lt;int, GeoName&gt; geoNamesSortedList, GeoNamesEntities entities) { var lineReader = File.ReadLines(AlternateNamesPath); var alternativeNames = from line in lineReader.AsParallel() let fields = line.Split(new char[] { '\t' }) let fieldCount = fields.Length where fieldCount &gt;= 4 &amp;&amp; fields[IsoLanguageColumn] == "post" let geoNameId = int.Parse(fields[AltNameGeoNameIdColumn]) orderby geoNameId select new AlternateName { Id = Guid.NewGuid(), AlternateNameId = int.Parse(fields[AlternateNameIdColumn]), ParentGeoNameId = geoNameId, Name = fields[AlternateNameColumn], IsoLanguage = fields[IsoLanguageColumn] }; //Iterate through to convert from lazy (AsParallel) so it is ready for use foreach (var alternateName in alternativeNames) { int key = alternateName.ParentGeoNameId; if (geoNamesSortedList.ContainsKey(key)) { entities.GeographicAreas.AddObject(alternateName); alternateName.Parent = geoNamesSortedList[key]; } } entities.SaveChanges(); } } </code></pre> <p>There is also Open Street Maps that you can <a href="http://wiki.openstreetmap.org/wiki/Planet.osm" rel="noreferrer">download</a> or use their <a href="http://wiki.openstreetmap.org/wiki/API" rel="noreferrer">API</a>.</p> <p>I do not suggest Yahoo's new API they are cutting products left and right and you never know how long it will be around. Also you cannot download a whole dump currently.</p>
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