District 4 is bounded by Altadena, Washington, Martelo, Casa Grande, Mountain, Palo Verde, the 210 Freeway, Oak, Colorado, San Gabriel, Lombardy, Sunnyslope, Grayburn, Del Mar, Green, Colorado, Frontage, Foothill, Michillinda, Shaw Ranch, Sierra Madre Blvd, Sierra Madre Villa, Fairpoint, Villa Knolls, New York, and Eaton Canyon.