This was followed by 462,725 Bangladeshi and 222,880 Pakistani workers, according to Oman's National Centre for Statistics and Information (NCSI).
The number of Sri Lankan workers stood at 12,431, a Times of Oman report said.
There was a 4.1 per cent rise in Ethiopian workers, where 38,915 people were registered with the Directorate General of Civil Status in April while the number in March stood at 37,394, according to the report.
The report also showed that 53,466 expatriate workers are employed in the government sector, while 1,220,579 workers are employed in the private sector in Oman.
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There was also a 1.3 per cent rise in Bangladeshi workers in April 2013 compared to the figure in March 2013.
But at the end of April 2013, the number of Bangladeshi workers stood at 462,725, whereas until the end of March, they had stood at 456,800.