As of now, there are over a thousand chapters. But the count keeps increasing as the story progresses.
The One Piece manga has a huge number of chapters. It's difficult to keep an exact count as new ones are still being released. But you can check the latest official sources for the most accurate number.
Chapter 847, "How Else Can You Argue?!", is the clearest early answer because it turns Gu Qiang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The Rong family couple watched the situation unfold, exchanged a...
Chapter 610, "Building a House?!", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. The chapter turns that into something concrete by moving from Therefore, Jiang Yan became even more entitled and bossily ordered...
Chapter 738, "Here to Fight!", is the clearest early answer because the buildup finally cashes out in a real clash. A useful checkpoint is the way the scene starts with Feeling that something was amiss, he immediately called Jiang Li.
Chapter 743, "They Have Already Been Released", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Too many people caused a commotion at Fang Family's place tonight,...
Chapter 531, "She Really is a Remarkable Person", is the clearest early answer because it turns Pei Ye's situation into a concrete plot event.
Chapter 779, "Unmarried but Have a Daughter?!", is the clearest early answer because it turns Chen Qijun's situation into a concrete plot event. The chapter turns that into something concrete by moving from Right, there's one more important thing," Shen Lan looked at Chen...
Chapter 685, "Defense Value Skyrockets!", is the clearest early answer because it turns Wu's situation into a concrete plot event.
Chapter 851, "Peace Charm", is the clearest early answer because it turns Shi Lei's situation into a concrete plot event. It opens with She initially came with the expectation of becoming the Gu Family's... and closes on The Old Madam also looked at Jiang Li..
The best chapter pointer here is Chapter 15, "The Autistic Teen Jiang Shixu". It opens with Jiang Shixu woke up from those nightmares filled with blood and darkness,... and closes on Since she didn't move, Jiang Shixu also stayed put, and the kitchen, which....
Chapter 922, "The Good Deed You Did!", is the clearest early answer because it turns Rong Kexi's situation into a concrete plot event.