Among them, 571 saw their wealth swell by 100 million won or more.

The country's public service ethics act requires senior government officials, lawmakers, heads of municipalities, members of local legislatures and senior judges to report their assets every year.

The average wealth of the high-level officials was tallied at 1.35 billion won ($1.2 million) as of the end of last year, up 76 million won from a year ago.

The rise in their assets was largely attributed to the increase in their real estate holdings, shares, personal savings and inheritances, the committee said.

Former President Park Geun-hye reported assets worth 3.73 billion won last year, up 218 million won from the previous year.

Her assets were reported to the committee late last year before her dismissal over a corruption scandal earlier this month.

In the past four years since Park took office in February 2013, her assets grew by nearly 1.2 billion won due in part to the rise in the value of her private house in Samseong-dong, southern Seoul, her deposits at local banks, and royalties from her autobiography published in 2007.

Heo Seong-joo, the director of the Seoul National University Dental Hospital, turned out to be the wealthiest senior public official with assets valued at 20.7 billion won. He was followed by Kim Hong-sub, the head of the Jung Ward Office in Incheon, with 19.4 billion won in wealth.

Lee Ryun-joo, a presidential secretary for national assignments, topped the list of well-heeled central government officials with 10.1 billion won in assets. The average wealth of senior presidential secretaries came to 1.55 billion won.

Lee was trailed by Kim Hak-kyun, a standing member of the Financial Services Commission, who reported 9.7 billion won in assets.

Acting President and Prime Minister Hwang Kyo-ahn posted 2.52 billion won in assets last year, up 360 million won from a year ago. The average wealth of senior officials at his office was tallied at 1.52 billion won.

Rep. Kim Byoung-gwan of the largest Democratic Party topped the list of wealthy lawmakers with personal assets totaling 167.8 billion won. Kim previously headed Webzen, a local game developer.

Rep. Kim Se-yeon of the minor Bareun Party ranked second with assets of 155.8 billion won, followed by Rep. Ahn Cheol-soo, a former co-chair of the minor People's Party, with 119.5 billion won in wealth. (Yonhap)