Via Sarah Kliff, here's a great graphic from Kaiser Family Foundation laying out how funds from the Affordable Care Act are being distributed across the country:
In total, over $12 billion has been handed out to state governments and private entities to implement the provisions of the ACA. Breaking it down by state, California—the first state to setup their own health exchange—has received the lion's share of funding, taking in over $1.1 billion. Other population heavy states such as New York, Texas, Michigan, and Ohio have taken in large sums as well. These funds aren't just being channeled to state governments; rather the lion's share has been directed to assist private entities. In Michigan, for example, $184 million in federal funds have gone to the state government but $630 million has been directed to private entities, mostly business to help with the costs of providing care.
You can look at the full breakdown of funds on Kaiser's interactive map here.