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You can get multiple map points asynchronously with multiple tasks (notice that it requires to convert PullInfo() to async-await):

public static async Task PullInfo() { // Create tasks to update items with latitude and longitude var tasks = SAPItems.Where(item => item.Latitude == null || item.Longitude == null) .Select(item => GetMapPoint(item.AddressLine1 + " " + item.FiveDigitZip) .ContinueWith(point => { item.MDM_Latitude = point.Latitude.ToString(); item.MDM_Longitude = point.Longitude.ToString(); })); // Non-blocking await for tasks completion await Task.WhenAll(tasks); // Iterate to append Lat and Long foreach(var item in SAPItems) Console.WriteLine(item.MDM_Latitude + " " + item.MDM_Longitude); } private static Task<MapPoint> GetMapPoint(string add) { return Task.Run(() => LocationService.GetLatLongFromAddress(add)); } 

If PullInfo() cannot be converted to async-await, you can force the thread to wait for the results, but it will block the current thread:

public static void PullInfo() { // Create tasks to update items with latitude and longitude var tasks = SAPItems.Where(item => item.Latitude == null || item.Longitude == null) .Select(item => GetMapPoint(item.AddressLine1 + " " + item.FiveDigitZip) .ContinueWith(point => { item.MDM_Latitude = point.Latitude.ToString(); item.MDM_Longitude = point.Longitude.ToString(); })); // Wait for tasks completion (it will block the current thread) Task.WaitAll(tasks.ToArray()); // Iterate to append Lat and Long foreach(var item in SAPItems) Console.WriteLine(item.MDM_Latitude + " " + item.MDM_Longitude); } private static Task<MapPoint> GetMapPoint(string add) { return Task.Run(() => LocationService.GetLatLongFromAddress(add)); }