University Commons is a small neighborhood in San Marcos in California through which San Elijo Road cuts. It enjoys Rancho Santa Fe Road as one border and a handful of other smaller borders. It is uniquely shaped into five small sections that are all aligned. It has a population of 409 residents because it is quite small in size and half of the area is commercial. The average household income for this particularly small neighborhood is $162,000 which is about $120,000 higher than the average for San Marcos.