DECLARE @temp TABLE (TableName VARCHAR(100), [RowCount] INT)

DECLARE @QueryString NVARCHAR(MAX) ;

SELECT @QueryString = COALESCE(@QueryString + ' UNION ALL ','')
                      + 'SELECT '
                      + '''' + QUOTENAME(SCHEMA_NAME(sOBJ.schema_id))
                      + '.' + QUOTENAME(sOBJ.name) + '''' + ' AS [TableName]
                      , COUNT(*) AS [RowCount] FROM '
                      + QUOTENAME(SCHEMA_NAME(sOBJ.schema_id))
                      + '.' + QUOTENAME(sOBJ.name) + ' WITH (NOLOCK) '
FROM sys.objects AS sOBJ
WHERE
      sOBJ.type = 'U'
      AND sOBJ.is_ms_shipped = 0x0
ORDER BY SCHEMA_NAME(sOBJ.schema_id), sOBJ.name ;

INSERT INTO @temp (TableName, [RowCount])
EXEC sp_executesql @QueryString
--GO

SELECT * FROM @temp ORDER BY TableName, [RowCount] DESC