Baton Rouge riverboat casinos’ September haul inched upward to $21.1 million, compared with $20.9 million a year ago.

The Belle of Baton Rouge’s revenue was up $200,000 to $4.7 million. That helped offset slight declines at competitors L’Auberge and Hollywood Casino, which took in $11 million and $5.4 million, respectively, according to figures released Thursday by Louisiana State Police.

Overall, Louisiana’s 14 riverboats combined with Harrah’s land-based casino and slots at four racetracks to bring in a total $182.8 million in September, up 0.3 percent over the year-ago figures.

Riverboat casino revenue grew 1.1 percent to $129.6 million in September.

The Lake Charles area was the biggest gainer. Its two riverboat casinos upped their take to $38 million, an increase of 2.4 percent.

The New Orleans area was the only region in the state that reported a drop in riverboat revenue. Revenue slipped 3 percent to $19.7 million in September. It was the second consecutive month that the New Orleans riverboats’ revenue fell. Two of the market’s three riverboats — the Amelia Belle and Treasure Chest — reported lower receipts, at $3.7 million and $7.3 million, respectively. Boomtown New Orleans’ revenue was up slightly at $8.7 million.

Meanwhile, Harrah’s New Orleans Casino’s revenue rose by less than 1 percent to $24 million. The Fair Grounds saw revenue from slot machines dip 0.7 percent to $3.5 million.

The three riverboats, Harrah’s and Fair Grounds brought in $47.2 million. That compares with the $47.6 million in winnings during September 2013.

The Opelousas market, represented by the slots at Evangeline Downs, dropped 8.4 percent to $6.5 million.

Delta Downs racetrack in Vinton posted a 0.4 percent gain.

The Shreveport-Bossier City market saw a 1.7 percent gain to $50.8 million at the area’s six riverboats, which offset an 8.3 percent decrease from the slots at the Harrah’s racetrack in Bossier City.

Follow Ted Griggs on Twitter, @tedgriggsbr.