The aftershocks jangled nerves in towns south of Zagreb where Tuesday's 6.4-magnitude quake left gaping holes in buildings and crushed cars under mountains of bricks.
Many in and around the the hard-hit town of Petrinja spent a sleepless night in fear of new tremors, with some opting to pass the night in cars or shelter in a nearby military barracks.
"We spent the night in the car with our children, as did our inlaws in theirs. Our house is gone, it's all cracked inside, we can't be there anymore", a young woman from the small village of Majske Poljane, where five were killed, told regional broadcaster N1.
The dead also included a young girl who was struck dead by falling debris on a street in Petrinja, and another man who was buried beneath rubble in a nearby village church, a priest told state news agency HINA.
Wednesday morning's 4.8 and 4.7 magnitude aftershocks rattled the region before dawn, striking near the same epicentre 50 kilometres (30 miles) south of Zagreb, according to the United States Geological Survey (USGS).
Rescue teams with dogs had spent the night scouring ruins in the area, but no new victims were found by the mountain rescue service, the organisation's chief Josip Granic told reporters.
At least 20 people were injured, Croatian police said, while six were rescued alive Tuesday from the wreckage with the help of dogs.
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