Error code:   ConfigNamesError
Exception:    AttributeError
Message:      'str' object has no attribute 'items'
Traceback:    Traceback (most recent call last):
                File "/src/services/worker/src/worker/job_runners/dataset/config_names.py", line 67, in compute_config_names_response
                  config_names = get_dataset_config_names(
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.12/site-packages/datasets/inspect.py", line 161, in get_dataset_config_names
                  dataset_module = dataset_module_factory(
                                   ^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.12/site-packages/datasets/load.py", line 1207, in dataset_module_factory
                  raise e1 from None
                File "/usr/local/lib/python3.12/site-packages/datasets/load.py", line 1182, in dataset_module_factory
                  ).get_module()
                    ^^^^^^^^^^^^
                File "/usr/local/lib/python3.12/site-packages/datasets/load.py", line 690, in get_module
                  config_name: DatasetInfo.from_dict(dataset_info_dict)
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.12/site-packages/datasets/info.py", line 284, in from_dict
                  return cls(**{k: v for k, v in dataset_info_dict.items() if k in field_names})
                                                 ^^^^^^^^^^^^^^^^^^^^^^^
              AttributeError: 'str' object has no attribute 'items'

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California Business Email List — Market Intelligence Dataset

3,200,000 verified California, USA contacts are available from LeadsBlue →. This open dataset provides the aggregate market intelligence behind that database — contact volume, benchmark open/reply rates, send timing, and compliance for the California, USA segment.

At a glance: This dataset provides aggregated market-intelligence on the California Business Email List segment — real business-population statistics, cold-email performance benchmarks, and compliance context compiled by LeadsBlue Research.

Key figures

Metric	Value
Verified contacts in segment	3,200,000
Typical email open rate	18-26%
Typical email reply rate	3-7%
Best send days	Tuesday, Wednesday, Thursday
Best send time (local)	08:00-10:00 ET
Geography	California, USA
Industry verticals benchmarked	14
License	CC BY 4.0

📥 Get the full California Business Email List — individual verified business records, ready to use: Download from LeadsBlue →

Market overview

California is part of the United States B2B market with 3,200,000 verified business contacts in LeadsBlue's database. Businesses in California operate under US federal CAN-SPAM rules, which permit B2B cold email without prior consent provided messages include accurate headers, a valid physical address, and a working opt-out. The figures below use US national benchmarks applied to the California segment.

The US B2B market is the largest and most data-dense in the world, with over 33 million registered businesses spanning every industry vertical. Technology dominates the coasts — Silicon Valley, Seattle, and New York City — while manufacturing holds the Midwest (Michigan, Ohio, Illinois), energy anchors Texas, healthcare clusters in Boston and Nashville, and financial services concentrate in New York and Charlotte. Decision-making speed is faster than any other major market: US executives are accustomed to cold outreach and respond within the same decision cycle that takes weeks in European or Asian equivalents.

Primary business hubs: New York City, San Francisco Bay Area, Austin, Chicago, Boston.

Outreach benchmarks & strategy

US B2B cold email runs on volume and cadence. A 7-touch sequence over 21 days is standard — American SDR culture expects and accepts follow-ups in a way that European markets do not. Lead with a single, specific claim relevant to their role and company size, use social proof from recognizable US brands in their vertical, and make the ask clear in the first email rather than building to it. Subject lines with a direct question or specific number (stat, dollar amount, time frame) consistently outperform curiosity-gap or clever subject lines in US B2B contexts.

Files in this dataset

File	Contents
`data/market_overview.csv`	Segment-level metrics: contact volume, benchmark rates, send timing
`data/industry_benchmarks.csv`	Open/reply benchmarks across 14 industry verticals
`data/compliance.csv`	Regulatory framework, business culture, decision-maker profile, hubs

Methodology

Statistics are derived from LeadsBlue's verified database counts combined with published market baselines. This dataset contains aggregate figures only; it includes no individual contact records.

How to cite

LeadsBlue Research. (2026). California Business Email List — Market Intelligence Dataset. Derived from the B2B Cold Email Benchmark Report 2026 (https://doi.org/10.5281/zenodo.20136256). CC BY 4.0. Source: https://leadsblue.com

@dataset{leadsblue_california_business_dataset_2026,
  author    = {Johnson, Luther},
  title     = {California Business Email List -- Market Intelligence Dataset},
  year      = {2026},
  publisher = {LeadsBlue Research},
  doi       = {10.5281/zenodo.20136256},
  url       = {https://leadsblue.com/leads/usa-state-california-business-email-leads-database/}
}

Source & full dataset

This aggregate dataset is published by LeadsBlue Research. The full verified business email list — with individual business contact records — is available at California Business Email List.

Related resources: Benchmark report (Zenodo) · Research hub · Interactive tools

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