Sa Market used to belong to Cho village, but now it has been separated to become an independent administrative unit under Co Loa commune. Although it is a newly formed administrative unit, the name Sa Market has existed for a long time and is very familiar to the residents here.
The name Sa market is explained by the people because this is where the model of the capital of King An Duong Vuong is located. Sa market is located on the Sa bank of Thiep river (Hoang Giang) on the left bank, south, outside the outer citadel of Co Loa. The market is held on high ground every month, 6 times a month on the 1st, 6th, 11th, 16th, 21st and 26th of the lunar calendar. It is said that this was the trading point of the ancient city of Co Loa.
Folk song about adjacent markets in the region:
“Dau Market is To Market sentence
To Market bo Doc Market
Doc Market cot Sa Market
Sa Market is Coi Market beam
Coi Market is Dau Market fortune telling”.
Thus, it can be said that the ancient land of Co Loa, since being chosen as the capital, has become a densely populated area. Economic activities have been promoted, some handicrafts, especially bronze casting, have reached the peak of ancient casting. Ancient Co Loa stands out as an important urban area in ancient times, although the "market" element is not clear, it is shown in a typical market system, Sa Market. Gradually, the market element has developed more and more, forming a whole Sa Market area as it is today.

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