The women who won hail from vastly different parts of the country, ranging from Saudi Arabia's largest city to a small village near Islam's holiest site.
The 20 female candidates represent just one per cent of the roughly 2,100 municipal council seats up for grabs, but even limited gains are seen as a step forward for women who had previously been completely shut out of elections.
Women are still not allowed to drive and are governed by guardianship laws that give men final say over aspects of their lives like marriage, travel and higher education.
Around 7,000 candidates, among them 979 women, competed in
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the election for a seat on the municipal councils, which are the only government body elected by Saudi citizens. The two previous rounds of voting for the councils, in 2005 and 2011, were open to men only.
The conservative capital of Riyadh saw the most women candidates win, with four elected. The Eastern Province, where minority Shiites are concentrated, saw two women elected, said Hamad Al-Omar, who heads the General Election Commission's media council.
The mayor of the city of Mecca, Osama al-Bar, told the AP that a woman won in a village called Madrakah, about 150 kilometres north of the city which houses the cube-shaped Kaaba to which Muslims around the world pray.
Another woman won in Medina, where the Prophet Muhammad's first mosque was built.
Other women hailing from the kingdom's northernmost areas won, with two elected in Tabuk, one in al-Jawf and another in Hail. Additionally, a woman won in Saudi Arabia's southern border area of Jizan, another in Asir and two won in al-Ahsa.