When searching for synonyms for the phrase "county libraries," several options come to mind. One suggestion is "local libraries," which emphasizes the community aspect of these institutions. Another alternative is "regional libraries," highlighting the broader reach of their services beyond the immediate county boundaries. "Public libraries" is also an apt choice, conveying the fact that these institutions are free and open to all members of the public. Finally, "community libraries" is another option that emphasizes their crucial role in fostering a sense of connectivity and sharing within local communities. Each of these synonyms provides a slightly different nuance, but all convey the importance and value of these indispensable public resources.