Confusion about WorkitemIds

Question

I have a question on WorKItemId's. I have a little winform app and I'm using wiql to get a WorkItemCollection.

string strTFSCollection = GetConfigSetting(ConfigSectionName, "TFSURI") + GetConfigSetting(ConfigSectionName, "TFSTeamProjectCollection");

            TfsTeamProjectCollection prjCol = TfsTeamProjectCollectionFactory.GetTeamProjectCollection(new Uri(strTFSCollection));

            WorkItemStore store = prjCol.GetService<WorkItemStore>();
           
            string wiqlQuery = "SELECT [System.ID], [System.WorkItemType], [System.Title], [System.AssignedTo], [System.State] FROM WorkItems WHERE [System.TeamProject] = 'CorpInc'";
            wiqlQuery +=  " AND [System.AreaPath] = '" + projectName + "'" + "  AND  [State] = 'New' AND  [System.WorkItemType] in ('Bug','User Story')  ORDER BY [System.ID]"; 
            WorkItemCollection witCollection = store.Query(wiqlQuery);

            return witCollection;

Here is what I'm running from the server. My question is: the id's coming back from the server are 4 digit numbers, but the above query gives me a work item collection where the id's are up in the 37000 range. What's the story? Is there some internal id that I need to grab?

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KathyL