Good Mexican is hard to come by in Loudoun County, VA. In four years of living here, Los Tios is the best I've had yet.
It's in the old mill in Leesburg, and parking is across the street - about a one minute walk. The Mill has several restaurants in it.
The service is fast and friendly, and there are two outdoor seating/dining areas as well as the main dining inside.
Prices are reasonable, and the food is much better than other Mexican Places in the area. I would recommend Los Tios over El Sol Azteca and Los Toltecos.
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